Staggering in low-spin nuclear spectra of [gamma]-soft or triaxial nuclei

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.141· OSTI ID:6696054

Ji-zhi, L ^[1]

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1. China Center of Advanced Science and Technology (World Laboratory), P.O. Box 8730, Beijing 100080 (China) Department of Physics, Sichuan Union University, Chengdu 61064, Sichuan (China)

The [gamma]- or quasi-[gamma]-band energy staggering in low-spin, low-energy spectra of even-even nuclei is discussed. The staggering indices of [gamma]-soft and triaxial nuclei are calculated in the interacting boson model O(6) limit with three-body potential and general axially asymmetric rotor model with [beta] vibration, respectively. It is found that these staggering indices have opposite signs and provide clear distinctions between [gamma]-soft and triaxial shapes. The experimental data of energy spectra of 140 of even-even nuclei in the mass region [ital A]=64 to 200 are compared to the predictions for broken O(6) symmetry with varying strength of the three-body interaction, and for the axially asymmetric rotor model with varying [gamma] dependence. The results show that most nuclei with clear staggering are [gamma] soft or [gamma] unstable, but a few may be slightly triaxial, and that almost all the axial nuclei are slightly [gamma] soft, some of them exhibiting shape transitions from axial to [gamma]-soft to triaxial shape with increasing angular momentum.

• OSTI ID: 6696054
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 51:1; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663120* -- Nuclear Structure Models & Methods-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
COLLECTIVE EXCITATIONS
COLLECTIVE MODEL
DYNAMICAL GROUPS
ENERGY LEVELS
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
INTERACTING BOSON MODEL
LIE GROUPS
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEI
O GROUPS
SHELL MODELS
SPECTRA
SYMMETRY GROUPS