definition of a standard neutron field with the 7 li(p,n) 7 be reaction
DESCRIPTION
Definition of a standard neutron field with the 7 Li(p,n) 7 Be reaction. C. Lederer 1 , I. Dillmann 2 , U. Giessen 3 , F. Käppeler 4 , A. Mengoni 5 , M. Mosconi 3 , R. Nolte 3 , A. Wallner 1 1 Faculty of Physics, University of Vienna, Vienna - PowerPoint PPT PresentationTRANSCRIPT
Definition of a standard neutron field with the 7Li(pn)7Be reaction
C Lederer1 I Dillmann2 U Giessen3 F Kaumlppeler4 A Mengoni5 M Mosconi3 R Nolte3 A Wallner1
1 Faculty of Physics University of Vienna Vienna2 GSI and University of Giessen DarmstadtGiessen3 Physikalisch-Technische Bundesanstalt (PTB) Braunschweig4 Karlsruhe Institute of Technology (KIT) Karlsruhe5 IAEA Nuclear Data Section Vienna Vienna
7Li(pn)7Be as neutron source
bull for Ep=1912 keV quasi-maxwellian energy distribution with kT=25 keV
bull neutron emission forward peaked with 120deg opening angle
Ratynski and Kaumlppeler Phys Rev C 37 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bi
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-lives
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Direct measurement of Maxwellian-averaged cross-sections with 7Li(pn) source
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Claudia Lederer EFNUDAT final workshop 31-08-2010
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
7Li(pn)7Be as neutron source
bull for Ep=1912 keV quasi-maxwellian energy distribution with kT=25 keV
bull neutron emission forward peaked with 120deg opening angle
Ratynski and Kaumlppeler Phys Rev C 37 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bi
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-lives
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Direct measurement of Maxwellian-averaged cross-sections with 7Li(pn) source
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Claudia Lederer EFNUDAT final workshop 31-08-2010
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bi
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-lives
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Direct measurement of Maxwellian-averaged cross-sections with 7Li(pn) source
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Claudia Lederer EFNUDAT final workshop 31-08-2010
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-lives
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Direct measurement of Maxwellian-averaged cross-sections with 7Li(pn) source
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Claudia Lederer EFNUDAT final workshop 31-08-2010
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Direct measurement of Maxwellian-averaged cross-sections with 7Li(pn) source
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Claudia Lederer EFNUDAT final workshop 31-08-2010
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Motivation
Nucleosynthesis in stars beyond Fe bull s-process (slow neutron capture) responsible for 50 of
abundances between Fe and Bibull nuclear physics input (n) cross-sections half-livesbull stellar environments maxwellian neutron field s-process sites
kT~25 keV
F Kaumlppeler A Mengoni Nucl Phys A 777 (2006)
Direct measurement of Maxwellian-averaged cross-sections with 7Li(pn) source
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Claudia Lederer EFNUDAT final workshop 31-08-2010
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Claudia Lederer EFNUDAT final workshop 31-08-2010
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
Claudia Lederer EFNUDAT final workshop 31-08-2010
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Ratynski and Kaumlppeler (Phys Rev C 37 1988)bull spherical Au sample covering whole beambull absolute flux determination by 7Be activity of Li target
for transformation to Maxwellian-averaged cross-section (MACS)bull energy dependence of cross-sectionbull neutron spectrum
(25keV)EXP = 586 mb plusmn 14
Measurement of 197Au(n) at KIT
former FZK
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Other measurements of MACS at KIT
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
Claudia Lederer EFNUDAT final workshop 31-08-2010
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Other measurements of MACS at KIT
Short-lived radioisotopes bull Activation + decay countingbull 58Fe 59Co 87Rb 88Sr 89Y 139La etc
(Heil et al Dillmann et al Kaumlppeler et al OrsquoBrien et al)
Long-lived radioisotopes bull Activation + Accelerator Mass Spectrometry (AMS)bull AMS labs ATLAS (Argonne) GAMS (Munich) VERA (Vienna)bull 9Be 13C 40Ca 54Fe 5862Ni 78Se 209Bi etc (Coquard et al
Dillmann et al Nassar et al Rugel et al Wallner et al )
All relative to 197Au(n) cross-section
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
197Au(n) as standard cross-section
bull recommended standard for thermal and from 02-28 MeVbull 3-200 keV 6-8 discrepancy between Ratynski-Kaumlppeler
evaluation and standard evaluation
Figure by VG Pronyaev
bull new measurement of 197Au(n) with TOF technique (n_TOF GELINA)
bull EFNUDAT project new detailed measurement of 7Li(pn) spectrum at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Experimental setup at PTB
bull calibrated setup for angular distribution measurements
bull Proton source 375 MV Van de Graaff
bull Ep=1912plusmn1 keVbull Repetition Rate
0625 MHzbull Pulse width (FWHM) 3nsbull Average proton current
05-08 A
Claudia Lederer EFNUDAT final workshop 31-08-2010
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Experimental setup at PTB
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Target bull Metallic Li evaporated on Tabull 10 m thickness (565 gcmsup2)
protons slowed down below reaction threshold (Ethres=1881 keV)
Positions bull two flight paths 35 cm and 70 cmbull angles 0-65 deg steps of 5 deg
Detectorsbull moveable Li-glassbull Long counter (fluence determination)
Experimental setup at PTB
Claudia Lederer EFNUDAT final workshop 31-08-2010
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
moveable Li-glass detector
protons
location of Li-target (missing in picture)
Experimental setup at PTB
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Experimental setup at PTB
bull 70 cm flight path high energy resolution (lt1 keV)
bull 35 cm flight path low energy end of spectrum and background studies
bull reference runs twice a day at defined position (0 deg 70 cm)
bull runs with different targets (LiF on Ta and LiF on Ag)
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
-flash
flat background
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
bull dead-time correction and background subtraction
bull time-of-flight to neutron energy conversion
bull detection efficiency 6Li(nt)4He cross-section (standard)
bull neutron fluence long-counter
bull solid angle correction
Data reduction
70 cm flight path
28Si-resonance (Li-glass)
56Fe-resonance (ldquocoffee-resonancerdquo)
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Reference Runs different targets
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Reference Runs target stability
Claudia Lederer EFNUDAT final workshop 31-08-2010
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Reference Runs target stability
target degradation
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Different angles 35 cm vs 70 cm
Claudia Lederer EFNUDAT final workshop 31-08-2010
no target aging effect because
bull closer look to kinematics different angle covered at different flight paths
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Summed spectra
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on averaged cross-section
example 62Ni(n) (JENDL library)
bull 227 mb for Ratynski and Kaumlppeler spectrum
bull 237 mb for PTB spectrum
4 effect
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
197Au(n) (ENDF-B7 library)
bull 633 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
only 05 difference
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Summed spectra
bull W Ratynski and F Kaumlppeler Phys Rev C 37 595 (1988)
bull Fit from 0-90 keV of aEexp(-EkT) with kT = 25 keV
Claudia Lederer EFNUDAT final workshop 31-08-2010
effect on cross-section
example 197Au(n) (ENDF-B7 library)
bull 632 mb for Ratynski and Kaumlppeler spectrum
bull 630 mb for PTB spectrum
bull PINO- a tool for simulating neutron spectra resulting from the 7Li(pn) reaction R Reifarth et al Nucl Instr Meth A 608 139 (2009)
Missing Monte-Carlo simulations of exp setup
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Conclusions
bull ldquoaging-effectrdquo of target causing shift to lower energies but cannot explain differences in different flight paths
bull neutron spectrum not sensitive to different targets
bull low and high energy-end of spectrum comparable to Ratynski and Kaumlppeler measurement
bull differences to Ratynski and Kaumlppeler between 10-60 keV
bull good agreement to PINO simulation up to 15 keV
bull MC-simulations of various experimental effects underway
Claudia Lederer EFNUDAT final workshop 31-08-2010
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-
Thank you for your attention
- Definition of a standard neutron field with the 7Li(pn)7Be reaction
- 7Li(pn)7Be as neutron source
- Motivation
- Slide 4
- Slide 5
- Slide 6
- Measurement of 197Au(ng) at KIT
- Slide 8
- Slide 9
- Other measurements of MACS at KIT
- Slide 11
- Slide 12
- 197Au(ng) as standard cross-section
- Slide 14
- Experimental setup at PTB
- PowerPoint-Praumlsentation
- Slide 17
- Slide 18
- Slide 19
- Slide 20
- Slide 21
- Slide 22
- Slide 23
- Slide 24
- Slide 25
- Slide 26
- Slide 27
- Slide 28
- Slide 29
- Slide 30
- Slide 31
- Slide 32
- Slide 33
- Slide 34
- Slide 35
- Slide 36
- Slide 37
- Slide 38
- Slide 39
-