Abstract
Lifetimes of high spin states in the nucleus90Tc have been measured via the fusion evaporation reactions58Ni(36Ar,3pn)90Tc at 140 MeV and58Ni(35Cl,2pn)90Tc at 120 MeV beam energy. The OSIRIS spectrometer as well as a new neutron-γ-coincidence setup were used to measure lifetimes in the 10−12-10−9s range by the recoil distance Doppler-shift method. By means ofγ-multiplicity and neutron-gated spectra fifteen lifetimes wered-educed. The experimental branching ratios and transition probabilities are compared to predictions of shell model calculations in a restricted π(p1/2), π(g9/2), ν(p1/2), and ν(g9/2) configuration space. In most cases the agreement with the calculations using the Gross-Frenkel parameters is striking but the results for several yrare states very sensitively depend on the residual interaction used.
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