Multi-quasiparticle gamma-band structure in neutron-deficient Ce and Nd isotopes

Abstract

The newly developed multi-quasiparticle triaxial projected shell-model approach is employed to study the high-spin band structures in neutron-deficient even-even Ce- and Nd-isotopes. It is observed that gamma-bands are built on each intrinsic configuration of the triaxial mean-field deformation. Due to the fact that a triaxial configuration is a superposition of several K-states, the projection from these states results in several low-lying bands originating from the same intrinsic configuration. This generalizes the well-known concept of the surface gamma-oscillation in deformed nuclei based on the ground-state to gamma-bands built on multi-quasiparticle configurations. This new feature provides an alternative explanation on the observation of two I=10 aligning states in 134Ce and both exhibiting a neutron character.

15 pages, 9 figures, accepted by Nucl. Phys. A

References in corpus (3)

• Triaxial projected shell model study of gamma-vibrational bands in even-even Er isotopes
• Variation with mass of $\boldmath{B(E3; 0_1^+ \to 3_1^-)}$ transition rates in $A=124-134$ even-mass xenon nuclei
• Signature inversion -- manifestation of drift of the rotational axis in triaxial nuclei

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