Proton hole states in Y95 and Nb95,97,99

The proton hole states of Y95 and Nb95,97,99 have been studied by the (t,) reaction using a polarized beam of 17 MeV tritons on targets of Zr96 and Mo96,98,100. The results yield a number of new levels as well as numerous new spin assignments based on the large analyzing powers characteristic of the (t,) reaction. Examination of the systematics of the resulting level schemes indicates a tendency towards deformation with increasing neutron number, which is expected given the known deformed region above A=100. However, Nb97 is also clearly affected by the N=56 subshell closure. This subshell closure has a major effect on the level structure of Zr96 but is completely washed out in Mo98. NUCLEAR REACTIONS Zr96, Mo96,98,100(t,), E=17 MeV; measured (), Ay(); deduced J DWBA analysis.