Proton Single-Particle States In The Heaviest Actinide Nuclei

Journal Article · Tue Apr 05 00:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1905319· OSTI ID:20630848

Ahmad, I; Kondev, F G; Moore, E F; Chasman, R R; Carpenter, M P; Greene, J P; Janssens, R V.F.; Lauritsen, T; Lister, C J; Seweryniak, D ^[1]; Hoff, R W; Evans, J E; Lougheed, R W ^[2]; Porter, C E; Felker, L K ^[3]

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1. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
3. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

The level structure of 249Bk has been investigated by measuring the {gamma}-ray spectra following the {alpha} decay of a chemically and isotopically pure 253Es sample. Alpha-gamma coincidence measurement was performed using a Si detector for {alpha} particles and a 25% Ge detector for {gamma} rays. A gamma-gamma coincidence measurement was performed with the Gammasphere spectrometer. The Es sample was obtained by extracting the 253Es which grew in a 253Cf source material produced in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Additional information on the 249Bk levels was obtained from the study of {gamma} rays produced in the {beta}- decay of 249Cm. The 249Cm sample was produced by neutron irradiation of 248Cm. Using the results of the present study and the results of previous 248Cm({alpha},t) and 248Cm(3He,d) reaction spectra, the following single-particle states have been identified in 249Bk: 7/2+[633], 0.0 keV; 3/2-[521], 8.78 keV; 1/2+[400], 377.55 keV: 5/2+[642], 389.17 keV; 1/2-[530], 569.19 keV; 1/2-[521], 643.0 keV; 5/2-[523], 672.8 keV; 9/2+[624], 1075.1 keV. Four vibrational bands were identified at 767.9, 932.2, 1150.7 and 1223.0 keV with tentative assignments of {l_brace}7/2+[633]x1-{r_brace}9/2-, {l_brace}7/2+[633]x0-{r_brace}7/2-, {l_brace}7/2+[633]x1-{r_brace}5/2- and {l_brace}7/2+[633]x0+{r_brace}7/2+, respectively.

• OSTI ID: 20630848
• Journal Information: AIP Conference Proceedings, Vol. 764, Issue 1; Conference: Conference on nuclei at the limits, Argonne, IL (United States), 26-30 Jul 2004; Other Information: DOI: 10.1063/1.1905319; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
ALPHA PARTICLES
BERKELIUM 249
BETA DECAY
CALIFORNIUM 253
CURIUM 248
CURIUM 249
EINSTEINIUM 253
GAMMA RADIATION
GAMMA SPECTRA
GE SEMICONDUCTOR DETECTORS
HFIR REACTOR
KEV RANGE
NEUTRON REACTIONS
NEUTRONS
ORNL
PROTONS
SINGLE-PARTICLE MODEL
VIBRATIONAL STATES