Abstract
Recent measurements of the electromagnetic transition rates among the positive parity states of the ground and gamma bands in the even mass Pt nuclei are explained using an extended version of the asymmetric rotor model which includes both the quasi particles and the collective excitations, as well as the coupling between the two. Apart from a satisfactory description of the low-spin transitions, it is shown that the transitions involving high-spin states, viz. branching of the yrast 12 + state to different 10 + states, are well accounted for in terms of the mixing between the 0-qp and the 2-qp proton and neutron excitations.
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