Spectroscopy of Zr-91(51) at medium to high spins

Abstract

Identification of near-yrast states in the beta-stable nucleus Zr-91(51) has been carried out using the fusion evaporation reactions Se-82(C-13,4n)Zr-91 at an incident beam energy of 50 MeV. States above the reported inverted perpendicular = 6 mu s, I-pi = 21/2(+) isomeric level at E-x = 3167 keV have been identified for the first time in this work, a tentative decay scheme of near-yrast states to excitation energies in excess of 10 MeV has been constructed. These states are of relevance to shell model structures formed via limited valence-space configurations in this semi-magic N = 51 nucleus.