Candidate chiral nuclei in bromine isotopes based on triaxial relativistic mean field theory

Abstract

Following the observation of candidate chiral doublet bands in $^{78,80}$Br, triaxial deformations with corresponding configurations in odd-odd bromine isotopes have been investigated using adiabatic and configuration-fixed constrained triaxial relativistic-mean-field calculations with an aim of finding the boundary of chirality in the chain of Br isotopes. Several minima with triaxial deformation and the proper particle-hole configuration were obtained in $^{74,76,78,80,82}$Br, where the chiral doublet bands have the possibility of occurrence. Furthermore, the possible existence of multiple chiral doublet (M$\chi$D) bands is demonstrated in $^{74,76,78,80,82}$Br. Experiments to explore the chirality and M$\chi$D properties of Br isotopes are conducted to verify the predictions.