ELECTROMAGNETIC DECAY STRENGTHS IN THE ISOBARS NB-89, MO-89 AND TC-89

Lifetimes of high spin states in the three A = 89 isobars Nb-89, (89)M O and (TC)-T-89 have been measured via the Recoil Distance Doppler Shi ft technique and the fusion evaporation reactions Ni-58(Cl-35, xnypz a lpha) at 120 MeV beam energy. Reduced transition probabilities for abo ut 50 gamma transitions were extracted. The experimental branching rat ios in Mo-89 and reduced transition probabilities in all three isobars are compared with the predictions of the spherical shell model based on the restricted pi(p(1/2)), pi(g(9/2)), nu(p(1/2)), nu(g(9/2)) confi guration space with two different types of residual interaction.