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

TL;DR

This paper introduces a multi-quasiparticle triaxial projected shell-model approach to study high-spin gamma-band structures in neutron-deficient Ce and Nd isotopes, revealing complex band formations and explaining experimental observations.

Contribution

It presents a novel theoretical framework that generalizes gamma-oscillation concepts by accounting for multi-quasiparticle configurations and triaxial superpositions in nuclear structure.

Findings

Gamma-bands are built on each intrinsic configuration.

Multiple low-lying bands arise from superpositions of K-states.

Explains the two I=10 states in 134Ce with neutron character.

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.