Abstract
Excited states of 80Br have been investigated via the 76Ge(11B, α3n) and 76Ge(7Li, 3n) reactions and a new ΔI=1 band has been identified which resides ∼ 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 πg9/2⊗νg9/2 configuration is proposed, which provides the first evidence for chirality in the A∼80 region.
Highlights
The spontaneously broken chiral symmetry is a well-known phenomenon in chemistry, biology and particle physics
It is interesting to search for more candidates in other mass regions with the fingerprints for chirality in Refs. [3, 18] to show that these chiral symmetry properties are of a general nature and not related only to a specific nuclear mass region
The clover detectors have been arranged in two rings at 90◦ and 135◦ with respect to the beam direction, the directional correlation of oriented (DCO) nuclei ratios for γ transitions can be extracted
Summary
The spontaneously broken chiral symmetry is a well-known phenomenon in chemistry, biology and particle physics. This phenomenon in atomic nuclei has attracted significant attention and intensive discussion. The first prediction of chiral effects in atomic nuclei was made by Frauendorf and Meng in 1997 [1]. They pointed out that the rotation of triaxial nuclei may give rise to pairs of identical ∆I=1 bands with the same parity, which are called chiral doublet bands [1]. It is interesting to search for more candidates in other mass regions with the fingerprints for chirality in Refs. It is interesting to populate high-spin states of the odd-odd nucleus 80Br and to search for chiral doublet bands
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