STRUCTURE OF HIGH-SPIN STATES IN SN-104 - E2 AND E3 POLARIZATION OF THE SN-100 CORE

High spin states in Sn-104 were identified in the reaction Ni-58(Cr-50 , 2p2n) at 200 and 205 MeV beam energies. The gamma-ray energies, inte nsities, multipolarities, and lifetimes of high spin states were measu red with the GASP spectrometer array in combination with a plunger app aratus by means of the recoil distance Doppler shift method. The deduc ed level scheme and transition probabilities are compared to the resul ts of large-scale shell model calculations using three independent two -body interactions. The agreement of the level energies is satisfactor y, except for a cascade of dipole transitions at high spins. The gener al good agreement found for E2 transition strengths implies a large ef fective neutron polarization charge. The shell-model calculations do n ot account for the measured enhanced E3 transitions for which a core e xcited octupole phonon admixture is indicated.