Nuclear shapes from spectroscopic studies of fission fragments [electronic resource]
Partial level schemes for several neutron-rich Ba and Ce nuclei have been determined from the study of gamma-gamma coincidences in ²⁵²Cf fission fragments. The experiment was performed with the Argonne-Notre Dame gamma ray facility, which consisted of 7 Compton- suppressed Ge detectors, a low-energy...
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Online Access |
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Corporate Author: | |
Format: | Government Document Electronic eBook |
Language: | English |
Published: |
Argonne, Ill. : Oak Ridge, Tenn. :
Argonne National Lab ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1989.
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Summary: | Partial level schemes for several neutron-rich Ba and Ce nuclei have been determined from the study of gamma-gamma coincidences in ²⁵²Cf fission fragments. The experiment was performed with the Argonne-Notre Dame gamma ray facility, which consisted of 7 Compton- suppressed Ge detectors, a low-energy photon spectrometer and an inner ball of fourteen hexagonal BGO detectors. Gamma-gamma coincidence events between the Ge detectors, which were accompanied by a gamma in BGO detectors, were accepted. The triple coincidence requirement eliminated most of the beta-decay background. Transitions in individual Ba and Ce nuclei were identified by gating on the known 2⁺ ..-->.. O⁺ gamma rays. Level schemes deduced from these studies indicate interleaved negative and positive parity levels in ¹⁴⁴Ba, ¹⁴⁶Ba and ¹⁴⁶Ce which are connected by fast E1 transitions. Both these features are signature of octupole deformation (reflection asymmetric shape) and are reproduced by recent theoretical calculations. 4 refs., 1 fig., 1 tab. |
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Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 01/01/1989. "conf-890406-1" "DE89000597" Fifty years with nuclear fission conference, Gaithersburg, MD, USA, 25 Apr 1989. Phillips, W.R.; Holzmann, R.; Janssens, R.V.F.; Khoo, T.L.; Ahmad, I.; Drigert, M.W.; Emling, H. |
Physical Description: | Pages: 6 : digital, PDF file. |