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

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 $A\sim 80$ region.

arXiv comment15 pages, 6 figures, accepted for publication in Physics Letters B

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• Chiral geometry and rotational structure for ${}^{130}$Cs in the projected shell model
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• Possible chiral doublets in ${}^{60}$Ni
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• Systematic investigations of positive-parity doublet bands with three-quasiparticle configurations in ${}^{125,127,129,131}$Cs