Observation of a $\gamma$-band based on two-quasiparticle configuration in $^{70}$Ge

TL;DR

This paper reports the discovery of a new gamma-band structure in $^{70}$Ge, revealing complex band interactions and crossings through gamma-ray spectroscopy and microscopic modeling.

Contribution

It presents the first observation of a gamma-band based on a two-quasiparticle configuration in $^{70}$Ge, combining experimental data with theoretical analysis.

Findings

Identification of a new gamma-band structure

Observation of band forking from the ground state

Demonstration of band crossing involving neutron aligned configurations

Abstract

The structure of $^{70}$Ge has been studied through in-beam gamma ray spectroscopy. A new band structure is identified that leads to forking of the ground-state band into two excited bands. Band structures have been investigated using the microscopic triaxial projected shell model approach. The observed forking is demonstrated to result from almost simultaneous band crossing of the two neutron aligned and the \gamma-band built on this two-quasiparticle configuration with the ground-state band.