Yrast transition strengths in85Rb and85Sr

High spin states in85Rb and85Sr were populated in the reactions76Ge(12C,p2n) and76Ge(12C,3n), respectively. The lifetimes of twelve states were measured via the recoil distance Doppler shift technique. The positive parity bands in both nuclei associated with theg9/2 orbit exhibit decrasingE2 strengths for increasing spin value marking the onset of multiparticle excitation.