Transition strengths and shapes of 2-qp bands in 74Se and 76Kr

Abstract

The lifetimes of the states of ve parity 2-qp bands of AE ¼ nuclei Se and Kr were measured. The transition strengths and quadrupole moments, obtained from the lifetimes, show a large collectivity of such bands in both the nuclei. The alignment frequencies were calculated from Woods-Saxon cranking model. Previously suggested quasi proton nature of band 5 and 6 of Se were argued to be based on quasi neutron excitations. The total Routhian surface calculations suggest triaxial shapes with large +ve and ve values of triaxiality parameter after proton and neutron alignments in these bands respectively.