High spin spectroscopy of Sn-104

High spin states in Sn-104 were identified in the reaction Ni-58(Cr-50, 2p2 n) at 200 MeV and 205 MeV beam energies. The gamma-ray energies, intensitie s, multipolarities and lifetimes of high spin states were measured with the GASP spectrometer array in combination with a plunger apparatus by means o f the recoil distance Doppler shift method. The deduced level scheme and tr ansition probabilities are compared to large scale shell model calculations . The agreement of the level energies is satisfactory, except for a cascade of dipole transitions at high spins. The general good agreement found for E2 transition strengths implies a large effective neutron polarization char ge. The measured enhanced E3 transitions cannot be accounted for, which ind icates an admixture of a core excited octupole phonon.