Nuclear shapes from spectroscopic studies of fission fragments
Conference
·
OSTI ID:6453020
Partial level schemes for several neutron-rich Ba and Ce nuclei have been determined from the study of gamma-gamma coincidences in /sup 252/Cf 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/sup +/ ..-->.. O/sup +/ gamma rays. Level schemes deduced from these studies indicate interleaved negative and positive parity levels in /sup 144/Ba, /sup 146/Ba and /sup 146/Ce 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.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6453020
- Report Number(s):
- CONF-890406-1; ON: DE89000597
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
651720 -- Nuclear Properties & Reactions
A=90-149
Experimental
652020* -- Nuclear Properties & Reactions
A=220 & above
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
BARIUM 142
BARIUM 144
BARIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALIFORNIUM 252
CALIFORNIUM ISOTOPES
CESIUM 146
CESIUM ISOTOPES
DEFORMATION
EVEN-EVEN NUCLEI
FISSION FRAGMENTS
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
ISOTOPES
MEAN-FIELD THEORY
MILLISEC LIVING RADIOISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEAR DEFORMATION
NUCLEAR FRAGMENTS
NUCLEAR STRUCTURE
NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
YEARS LIVING RADIOISOTOPES
A=90-149
Experimental
652020* -- Nuclear Properties & Reactions
A=220 & above
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
BARIUM 142
BARIUM 144
BARIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALIFORNIUM 252
CALIFORNIUM ISOTOPES
CESIUM 146
CESIUM ISOTOPES
DEFORMATION
EVEN-EVEN NUCLEI
FISSION FRAGMENTS
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
ISOTOPES
MEAN-FIELD THEORY
MILLISEC LIVING RADIOISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEAR DEFORMATION
NUCLEAR FRAGMENTS
NUCLEAR STRUCTURE
NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
YEARS LIVING RADIOISOTOPES