Lifetime measurements in 80Br and a new region for observation of chiral electromagnetic selection rules

Level lifetimes for the candidate chiral doublet bands of Br-80 were extracted by means of the Doppler-shift attenuation method. The absolute transition probabilities derived from the lifetimes agree well with the M1 and E2 chiral electromagnetic selection rules, and are well reproduced by the triaxial particle rotor model calculations. Such good agreements among the experimental data, selection rules of chiral doublet bands and theoretical calculations are rare and outstanding in researches of nuclear chirality. Besides odd-odd Cs isotopes, odd-odd Br isotopes in the A approximate to 80 mass region represent another territory that exhibits the ideal selection rules expected for chiral doublet bands. (C) 2022 The Author(s). Published by Elsevier B.V.

Automated summary

The lifetimes of the candidate chiral doublet bands of Br-80 were determined using the Doppler-shift attenuation method. The absolute transition probabilities derived from the lifetimes agree well with the chiral electromagnetic selection rules and are accurately predicted by the triaxial particle rotor model calculations. This agreement between experimental data, selection rules, and theoretical calculations is rare and significant in the field of nuclear chirality.