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Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
In-beam and decay spectroscopy of transfermium elements
251Md
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Contents
• Focal plane decay studies – 255Lr,253No
• In-beam electron spectroscopy – 254No
• In-beam gamma-ray spectroscopy – 254No, 250Fm, 251Md
• Future developments
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
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Focal Plane Decay Studies
Recent Experiments:• 255Lr alpha decay (P.T. Greenlees et al., JYFL)
also studied in GANIL (Ch. Theisen et al., Saclay)and at GSI in decay of 259Db (F.P.Heßberger et al., GSI)
• 255No alpha decay/254No Isomer (JYFL expt - R.-D. Herzberg et al., Uni. Liverpool)254No Isomer also studied at ANL (T.L. Khoo et al.,ANL)
• 253No alpha decay (JYFL expt - R.-D. Herzberg et al., Uni. Liverpool)(GSI expt - F.P.Heßberger et al., GSI)
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
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Single-Particle States in 255Lr
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
Theory:
100
7/2-
5/2-
7/2+
9/2+1/2-
0
0.5
WS HFB
Cwiok et al.,
NPA 573 (1994) 356
Bender et al.,
NPA 723 (2003) 354
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The GREAT Spectrometer
• UK Universities + Daresbury• 2 x 60mm x 40mm DSSD• 28 x 28mm x 28mm PIN
Diodes• 24 x 12 Segmented Planar Ge• Compton-Suppressed
Segmented Ge Clover• Position-Sensitive MWPC• Total Data Readout (TDR)
Acquisiton System
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
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Alpha Decay of 255Lr – JYFL data
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
P. T. Greenlees et al. preliminary data
N.B. in-growth of 8.37 MeV peak
No α-γ or α-e coincidences
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Alpha Decay of 255Lr – GANIL data
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
Ch. Theisen et al.preliminary data
New states in 247EsStrongest α line is not
the g.s. to g.s. transition
290 keV
247Es
251Md
7544 keV
235 keV
7596 keV
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Alpha Decay of 253No
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
48Ca + 207Pb σ 1.3 bF. P. Heßberger et al. (GSI)R.-D. Herzberg et al. (JYFL)
Ground state expected to be 9/2[734]
Recoil-α-γ/CE measurements
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Alpha Decay of 253No – JYFL Expt.R.-D. Herzberg, J. Phys G30 (2004) R123
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
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The SACRED Electron Spectrometer
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
H. Kankaanpää et al., Accepted for publication in NIM A
see also P.A. Butler et al., NIM A381 (1996) 433
ENAM’04, Callaway Gardens, Sept04
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CE spectra from 208Pb(22Ne,4n)226U
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
H.Kankaanpää et al., Accepted for publication in NIM A
R.D. Humphreys et al.,
PRC 69 (2004) 064234
226U level scheme:
P.T. Greenlees et al.,
J. Phys. G 24 (1998) L63
ENAM’04, Callaway Gardens, Sept04
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Recoil-gated CE spectrum from 208Pb(48Ca,2n)254No
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
P.A. Butler et al.,
PRL 89 (2002) 202501
ENAM’04, Callaway Gardens, Sept04
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The JUROGAM Ge Array
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
43 PhaseI and GASP-type detectors – Ex. EUROBALL and UK-France loan pool
Efficiency ~ 4.2% @ 1.3 MeV
TDR data acquisition system – Data rate ~ 5 MB/s @ 10 kHz
Software BGO suppression
Autofill system built by University of York, part of GREAT Project
Online/Offline Sorting – Grain developed by P. Rahkila
ENAM’04, Callaway Gardens, Sept04
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Recoil-Gated Gamma-Ray Spectrum from 208Pb(48Ca,2n)254NoS.Eeckhaudt et al., JYFL – Poster 143
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
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Singles Gamma-Ray Spectra from 204Hg(48Ca,2n)250Fm
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
A. Pritchard, R.-D. Herzberg et al., University of Liverpool ”Online” Data!
ENAM’04, Callaway Gardens, Sept04
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Coincidence Gamma-Ray Spectra from 204Hg(48Ca,2n)250Fm
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
A. Pritchard, R.-D. Herzberg et al., University of Liverpool
”Online” Data!
Energy (keV)
Cou
nts
467
(20+
)ENAM’04, Callaway Gardens, Sept04
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Electromagnetic Properties
• Odd-proton orbitals in 251Md / 255Lr
• B(M1)/B(E2) depends on (gK-gR)/Q0
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
gK ~ 0.7 Mainly E2[514] 7-
2
7 -
2
7 +
2
[633] 7+
2gK ~ 1.3 Mainly M1
1 -
2
[521] 1-
2a ~ 0.9:
gK ~ -0.55
Mainly E2
ENAM’04, Callaway Gardens, Sept04
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Recoil-Gated Gamma-Ray Spectrum from 205Tl(48Ca,2n)251Md
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
A. Chatillon, Ch. Theisen et al.,
CEA Saclay
ENAM’04, Callaway Gardens, Sept04
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Gamma-Gamma Coincidences 205Tl(48Ca,2n)251Md
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
A. Chatillon, Ch. Theisen et al., CEA Saclay
ENAM’04, Callaway Gardens, Sept04
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Dynamic Moments of Inertia J(2)
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
J (2
) (h
bar
2 MeV
-1)
Rotational Frequency
ENAM’04, Callaway Gardens, Sept04
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Future Developments
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
+ = SAGE
•Combined In-beam electron and gamma spectroscopy
•Liverpool/Daresbury/JYFL Collaboration
•Digital Electronics
Near Future:
•In-beam spectroscopy of 253No and 255Lr with JuroGam
ENAM’04, Callaway Gardens, Sept04
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Collaborators:
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
University of Liverpool, UKDAPNIA/SPhN CEA Saclay, FranceGSI Darmstadt, GermanyIReS Strasbourg, FranceANL Argonne, USA University of Helsinki, FinlandUniversity of Oslo, NorwayLudwig Maximilians Universität, GermanyNiels Bohr Institute, Denmark
ENAM’04, Callaway Gardens, Sept04
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250Fm Dynamic Moment of Inertia J(2)
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
Theory:
M. Bender et al., NPA 723 (2003) 354
ENAM’04, Callaway Gardens, Sept04
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251Md Dynamic Moment of Inertia J(2)
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
Theory:
M. Bender et al., NPA 723 (2003) 354
ENAM’04, Callaway Gardens, Sept04
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Cf Isotopes:
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
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Cm Isotopes:
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
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Fm Isotopes:
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland ENAM’04, Callaway Gardens, Sept04
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Gamma-Gamma Coincidences 208Pb(48Ca,2n)254No
Paul Greenlees, Department of Physics, University of Jyväskylä, Finland
S. Eeckhaudt et al., JYFLC
oun
ts
Energy (keV)
537
(22+
)
498
20+
ENAM’04, Callaway Gardens, Sept04