Symmetry Character of Bands in 72-84KR in the IBA-2 Model

The positive-parity bands observed in the even ^72-84Kr isotopes have been studied in the framework of the IBM-2 model. The comparison of experimental and predicted data includes excitation energies, B(E2)'s of intraband transitions and B(E2)'s, B(M1)'s, E2/M1 mixing ratios of interband transitions. Three bands of different structure can be accounted for in the framework of the model: the ground-state band, of predominant full-symmetry character, the band built on the 2_2⁺ state, which is composed by states which show different symmetry character, and the band built on the 3_1⁺ state, of predominant mixed-symmetry character.