Collective structures have been investigated via γ-ray studies in 117,119Sb. Previously observed strongly coupled (πg9/2)-1 bands in both nuclei involving 1p-1h proton excitations across the Z=50 gap have been extended, and an alignment of h11/2 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 119Sb, similar to those presented earlier for 117Sb. These bands are interpreted as due to the coupling of a low-K valence proton to the (πg7/2d5/2)2⊗(πg 9/2)-2 deformed state of the respective 50Sn core nuclei. Anomalies in the expected h11/2 neutron crossing of these bands are discussed.
ASJC Scopus subject areas
- Nuclear and High Energy Physics