multiplicity and energy of neutrons from 233 u(n th,f) fission fragments katsuhisa nishio japan...
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![Page 1: Multiplicity and Energy of Neutrons from 233 U(n th,f) Fission Fragments Katsuhisa NISHIO Japan Atomic Energy Agency (JAEA)](https://reader030.vdocument.in/reader030/viewer/2022032803/56649e1c5503460f94b0a527/html5/thumbnails/1.jpg)
Multiplicity and Energy of Neutrons from 233U(nth,f) Fission Fragments
Katsuhisa NISHIO
Japan Atomic Energy Agency (JAEA)
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Japan Atomic Energy Research Institute
Tokai InstituteJapan Atomic Energy Agency (JAEA),
Tokai Campus
Tokyo
Tokai
J-PARC
Tandem
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Contents
(1) Neutron multiplicity and energy spectrum measurement ➢ 235U(nth,f), 233U(nth,f), 239Pu(nth,f)
(2) Experiment at J-PARC
➢ n + actinide
➢ μ ー + actinide
Research Reactor, Kyoto University
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Contents
(1) Neutron multiplicity and energy spectrum measurement ➢ 235U(nth,f), 233U(nth,f), 239Pu(nth,f)
(2) Experiment at J-PARC
➢ n + actinide
➢ μ ー + actinide
![Page 5: Multiplicity and Energy of Neutrons from 233 U(n th,f) Fission Fragments Katsuhisa NISHIO Japan Atomic Energy Agency (JAEA)](https://reader030.vdocument.in/reader030/viewer/2022032803/56649e1c5503460f94b0a527/html5/thumbnails/5.jpg)
TokyoKyoto
Tokai
Supermirror Neutron Guide Tube
1964 First Criticality 5 MW Operation
Kyoto University Reactor
Research Reactor Institute, Kyoto University
5×107 neutrons/cm2/s
Osaka
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Fission Neutron Measurement at KURRI
Fission Fragment ( mass and kinetic energy ) ➢ Si-detector : Pulse height Analysis ➢ Parallel Plate Avalanche Counter : Time-of-Flight analysis
Prompt Fission Neutron (neutron energy) ➢ Flight path = 76.5 cm ➢ Liquid Scintillator NE213 ( Φ 5 ” × 2 ”)
K. Nishio et al., J. Nucl.Sci.Technol., 35, 631 (1998).
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Neutron Spectra
FWHM = 1.5 ns
For neutrons energy Spectra in the c.m. Frame ➢ Vn >= Vf1 / cos θ
Assumption : All the neutrons are emitted from the fully accelerated fragments
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Calculated Neutron yields
Fragment 1 Fragment 2 Neutron detector
θ < 18o
Light Fragment Heavy Fragment
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Fission Fragment Yield
233U(nth,f)
Tota
l Kin
etic
Ene
rgy
[MeV
]
Fragment Mass [u]
Q-value
80 90 100 110 120 130 140 150
140
160
180
200
220
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Neutron energy spectra from fragments in c.m. frame for 233U(nth,f)
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Average neutron energy from FFs for 233U(nth,f)
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Neutron multiplicities for 233U(nth,f)
ν L = 1.49
νH = 1.01
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Total Neutron multiplicity as function of TKE for 233U(nth,f)
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Neutron multiplicity from fragment as function of TKE for 233U(nth,f)
-d
/ dT
KE
(M
eV-1
)
Fragment Mass [u]
Yie
ld
(%)
132102
80 100 120 140 1600.00
0.02
0.04
0.06
0.08
0.10
0.12
0
1
2
3
4
5
6
7
8
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Scission configuration
233U(nth,f)132 u102 u
Tot
al K
inet
ic E
nerg
y [M
eV]
Fragment Mass [u]
Q-value
80 90 100 110 120 130 140 150
140
160
180
200
220
Neutron multiplicity ;
132 u
102 u
0 1 2 3 4 5
- d
/ dT
KE
[1/
MeV
] 132102
TKEFragment Mass [u]
Yie
ld [
%]
80 100 120 1400.00
0.02
0.04
0.06
0.08
0.10
0
1
2
3
4
5
6
7
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Level density parameters of fission fragments
Neu
tron
M
ulti
plic
ity
Mas
s Y
ield
(%
)
0
1
2
3
4
0
2
4
6
T (
MeV
)a
(M
eV -
1)
1.0
1.5
2.0
2.5
Fission FragmentStable Nuclei
E*=aT2
0
10
20
Fission Fragment
Stable Nuclei
132Sn78Ni
She
ll C
orre
ctio
n E
nerg
y
(MeV
)
Fragment Mass [u]80 100 120 140 160
-10
-5
0
5
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Total excitation energy of the fragments
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Total neutron multiplicity for each TKE
TKE (MeV)
233U(nth,f)
Tota
l Kin
etic
Ene
rgy
[MeV
] Fragment Mass [u]
Q-value
80 90 100 110 120 130 140 150
140
160
180
200
220
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Contents
(1) Neutron multiplicity and energy spectrum measurement ➢ 235U(nth,f), 233U(nth,f), 239Pu(nth,f)
(2) Experiment at J-PARC
➢ n + actinide
➢ μ ー + actinide
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J – PARC ( Japan Proton Accelerator Research Complex )
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3 GeV
Linac
Materials & LifeExperimental Hall
Hadron Experimental Hall
Materials & LifeExperimental Hall
NeutrinoTargetArea
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J - PARC
Energy (GeV)
Cur
rent
(μ
A)
Now 100 kW (300 kW)
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MLF Building MLF Materials and Life Science Facility
Mercury Target and Its Container
Shutter on the Top of the Source
ProtonBeam
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Neutron Beam Lines
Summer of 2007
MLF Materials and Life Science Facility
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MLF Materials and Life Science Facility
Proton
Neutron Time-of-flight cource
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Neutron TOF course
Undergoing measurement ➜ Neutron capture cross-sections for 244,245Cm, 129I, 99Tc, 93Zr ➜ Fission experiments can be proposed !
Flight path = 22 - 29 mNeutron energy = 0.01 eV – 100 keV
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Neutron induced Fission
➢ Prompt neutron multiplicity and energy spectra Mass – TKE correlations (Cm244,Cm245, …) Pre-scission neutron ?
I. Tsekhanovich et al., Phys.Rev.C 70 , 044610 (2004)
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Investigation for the Fission Neutrons
Neutron Detectors
Fission Fragment Detectors
Prompt Fisssion Neutron
Target
FragmentNeutron form J-PARC
Energy of prescission neutron ?
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Neutron induced Fission
➢ Fragment mass distribution and angular distributions from each resonances.
➢ Resonance tunneling through the collective states in the 2nd minimum ( mass distributions )
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Contents
(1) Neutron multiplicity and energy spectrum measurement ➢ 235U(nth,f), 233U(nth,f), 239Pu(nth,f)
(2) Experiment at J-PARC
➢ n + actinide
➢ μ ー + actinide
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muon course
•Positive or negative muons slower than 120 MeV/c are available. •Beam intensity (@ 100kW proton beam): 1.0×106/s
3 GeV proton
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μ - induced Fission
V.E. Oberacker et al., Phys.Rev.C 48, 1297 (1993).
Delayed Fission (78 ns in 238U)
Prompt Fission : muon stays at the fissioning nucleus
1s
2p
3d
?
E1(2p->1s) 238U = 6.6 MeVE2(3d ->1s) 238U = 9.6 MeV
H L
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