Yrast transition strengths in 77Kr

In the course of a systematic investication of electromagnetic transition probabilities in (N,Z)=(40,38) region, the results on high spin states in 77Kr are presented. According to Hartree-Fock calculations the nucleus 77Kr is expected to lie on the borderline between prolate and oblate deformation. The lowest gsub(9/2), psub(3/2) and fsub(5/2) Nilsson orbits are predicted to be prolate (β2 = 0.32 - 0.34, γ = 0 deg), whereas oblate 9/2+ and 1/2- band heads should occur only some 300 keV higher in energy. As E2 and M1 transitions are particularly sensitive to the structure of high spin states, their measurement should allow to fix the relevant single-particle orbits, deformation parameters and possible band mixing effects