Multiple chiral doublet bands with octupole correlations in reflection-asymmetric triaxial particle rotor model

摘要

A reflection-asymmetric triaxial particle rotor model (RAT-PRM) with a quasi-proton and a quasi-neutron coupled with a reflection-asymmetric triaxial rotor is developed and applied to investigate the multiple chiral doublet (M chi D) bands candidates with octupole correlations in Br-78. The calculated excited energies, energy staggering parameters, and B(M1)/B(E2) ratios are in a reasonable agreement with the data of the chiral doublet bands with positive- and negative-parity. It is found that both the triaxial deformation gamma and octupole deformation beta(3) influence the calculated B(E1) values. The chiral geometry based on the angular momenta for the rotor, the valence proton and valence neutron is discussed in details. (C) 2019 The Author(s). Published by Elsevier B.V.