The first candidate for chiral nuclei in the $A\sim80$ mass region: $^{80}$Br

TL;DR

This study reports the first evidence of nuclear chirality in the $A extasciimath{\sim}80$ mass region, specifically in $^{80}$Br, through experimental identification and theoretical analysis of chiral candidate bands.

Contribution

It presents the discovery of chiral bands in $^{80}$Br, supported by experimental data and triaxial particle rotor model calculations, marking the first such evidence in this mass region.

Findings

Identification of a new $ riangle I$=1 band above the yrast band.

Comparison with theoretical models suggests chiral character.

First evidence of chirality in the $A extasciimath{\sim}80$ mass region.

Abstract

Excited states of $^{80}$Br have been investigated via the $^{76}$Ge($^{11}$B, $\alpha$3n) and $^{76}$Ge($^{7}$Li, 3n) reactions and a new $\Delta I$ = 1 band has been identified which resides $\sim$ 400 keV above the yrast band. Based on the experimental results and their comparison with the triaxial particle rotor model calculated ones, a chiral character of the two bands within the $\pi g_{9/2}\otimes \nu g_{9/2}$ configuration is proposed, which provides the first evidence for chirality in the $A\sim80$ region.