Octupole instability in the heavy barium region
Quasi-molecular rotational bands characterized by spin states of alternating parity connected by enhanced E1 transitions have recently been observed in several transitional nuclei around /sup 224/Th. The appearance of such bands can easily be understood by assuming the absence of intrinsic parity symmetry in these nuclei. Another likely region on the chart of nuclides to find octupole-unstable nuclei is the region of nuclei around /sup 146/Ba. In fact, in several Xe, Ba and Ce isotopes with n approximately equal to 88, calculations yield octupole-unstable ground states. The main goal of the present study was to calculate equilibrium deformations of doubly-even Xe, Ba, Ce, Nd, Sm and Gd nuclei with neutron numbers between 84 and 94. The method used was the Woods-Saxon-Bogolyubov cranking model method combined with the shell correction approach. The results of these calculations confirm previous expectations of octupole deformed mean fields at low and medium spins in Xe-Sm nuclei with neutron numbers around N = 86. Recent experimental data support theoretical results. 8 refs., 1 fig. (DWL)
- Research Organization:
- Florida State Univ., Tallahassee (USA); Politechnika Warszawska (Poland). Inst. Fizyki; Oak Ridge Associated Universities, Inc., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6114277
- Report Number(s):
- CONF-8705188-1; ON: DE87012925; TRN: 87-034784
- Resource Relation:
- Conference: 25. winter school on nuclear structure, Zakopane, Poland, 1 May 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM ISOTOPES
DEFORMED NUCLEI
HIGH SPIN STATES
CERIUM ISOTOPES
GADOLINIUM ISOTOPES
NEODYMIUM ISOTOPES
SAMARIUM ISOTOPES
XENON ISOTOPES
CRANKING MODEL
E1-TRANSITIONS
EVEN-EVEN NUCLEI
ROTATIONAL STATES
SHELL MODELS
THEORETICAL DATA
WOODS-SAXON POTENTIAL
ALKALINE EARTH ISOTOPES
DATA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
INFORMATION
ISOTOPES
MATHEMATICAL MODELS
MULTIPOLE TRANSITIONS
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEI
NUMERICAL DATA
POTENTIALS
RARE EARTH ISOTOPES
653001* - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models