Intrinsic properties of high-spin band structures in triaxial nuclei

TL;DR

This paper investigates high-spin band structures in various triaxial nuclei using the TPSM approach, explaining band forking and character via gamma-bands and analyzing g-factors to match experimental data.

Contribution

It provides a detailed analysis of high-spin band structures and g-factors in triaxial nuclei using the TPSM, highlighting the role of gamma-bands based on two-quasiparticle configurations.

Findings

G-factors of excited bands are in fair agreement with predictions.

Band forking explained by gamma-bands based on two-quasiparticle configurations.

High-spin structures show neutron or proton character in some cases.

Abstract

The band structures of $^{68,70}$Ge, $^{128,130,132,134}$Ce and $^{132,134,136,138}$Nd are investigated using the triaxial projected shell model (TPSM) approach. These nuclei depict forking of the ground-state band into several s-bands and in some cases, both the lowest two observed s-bands depict neutron or proton character. It was discussed in our earlier work that this anamoluos behaviour can be explained by considering $\gamma$-bands based on two-quasiparticle configurations. As the parent band and the $\gamma$-band built on it have the same intrinsic structure, g-factors of the two bands are expected to be similar. In the present work, we have undertaken a detailed investigation of g-factors for the excited band structures of the studied nuclei and the available data for a few high-spin states are shown to be in fair agreement with the predicted values.