Particle-Hole Induced Intruder Bands In Sb-117 And Sb-119

Collective structures have been investigated via gamma-ray studies in Sb-117,Sb-119. Previously observed strongly coupled (pi g(9/2))(-1) bands in both nuclei involving 1p-1h proton excitations across the Z=50 gap have been extended, and an alignment of h(11/2) neutrons identified. New negative-parity strongly coupled bands based on this proton configuration have also been observed in both nuclei. Decoupled bands involving 2p-2h excitations across the gap have been observed in Sb-119, similar to those presented earlier for Sb-117. These bands are interpreted as due to the coupling of a low-K valence proton to the (pi g(7/2)d(5/2))(2)x(pi g(9/2))(-2) deformed state of the respective Sn-50 core nuclei. Anomalies in the expected h(11/2) neutron crossing of these bands are discussed.