Signature splitting in $^{173}$W with triaxial particle rotor model

TL;DR

This study uses a triaxial particle rotor model to accurately reproduce signature splitting in $^{173}$W, revealing the influence of nuclear deformation and orbital competition on energy spectra.

Contribution

The paper introduces a triaxial particle rotor model with a quasi-neutron to explain signature splitting phenomena in $^{173}$W, achieving excellent agreement with experimental data.

Findings

Signature splitting before inversion is well reproduced by including gamma deformation.

Strong competition between $2f_{7/2}$ and $1h_{9/2}$ influences signature splitting phase and amplitude.

Signature inversion remains unexplained within the current model framework.

Abstract

A particle rotor model with a quasi-neutron coupled with a triaxially deformed rotor is applied to study signature splitting for bands with intruder orbital $\nu7/2^{+} [633]$ and non-intruder orbital $\nu5/2^{-}[512]$ in $^{173}$W. Excellent agreement with the observed energy spectra has been achieved for both bands. Signature splitting for band $\nu7/2^{+} [633]$, and band $\nu5/2^{-}[512]$ before the onset of signature inversion, is satisfactorily reproduced by introducing the $\gamma$ degree of freedom. The phase and amplitude of signature splitting in band $\nu5/2^{-}[512]$ is attributed to strong competition between $2f_{7/2}$ and $1h_{9/2}$ components. However, the explanation of signature inversion in band $\nu5/2^{-}[512]$ self-consistently is beyond the present one quasi-neutron coupled with a triaxially deformed rotor.