Electromagnetic decay strengths in the isobars89Nb,89Mo and89Tc

Lifetimes of high spin states in the threeA=89 isobars⁸⁹Nb,⁸⁹Mo and⁸⁹Tc have been measured via the Recoil Distance Doppler Shift technique and the fusion evaporation reactions⁵⁸Ni(³⁵Cl,xnypzα) at 120 MeV beam energy. Reduced transition probabilities for about 50γ transitions were extracted. The experimental branching ratios in⁸⁹Mo and reduced transition probabilities in all three isobars are compared with the predictions of the spherical shell model based on the restrictedπ(p _1/2),π(g _9/2), ν(p_1/2),ν(g _9/2) configuration space with two different types of residual interaction.