In-beam spectroscopic study of Zn63

Abstract

Investigation on the excited states of $^{63}\mathrm{Zn}$ was done through in-beam $\ensuremath{\gamma}$-ray spectroscopic techniques using the $^{52}\mathrm{Cr}(^{18}\mathrm{O},\phantom{\rule{4pt}{0ex}}\ensuremath{\alpha}3n)$ fusion-evaporation reaction at a beam energy of 72.5 MeV. Detection of the emitted $\ensuremath{\gamma}$ rays from the excited nuclei was performed in the coincidence mode using 14 Compton suppressed Ge clover detectors of the Indian National Gamma Array. Based on the $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence data, 13 new transitions have been placed in the level scheme following their coincidence relationship and intensity balance. Spin and parity assignments of the excited levels have been carried out by extracting the directional correlation from oriented states ratio and polarization asymmetry values of the emitted $\ensuremath{\gamma}$ rays. Shell model calculations have been performed in the ${f}_{5/2}p{g}_{9/2}$ model space with a $^{56}\mathrm{Ni}$ core using the jj44bpn interaction, to interpret the observed excited states of the nucleus. A reasonable agreement is found between the experimental findings and the shell-model calculations. In order to understand the evolution of a collective shape built on the $9/{2}^{+}$ (1704 keV) state, we have performed total Routhian surface calculations with a $1{g}_{9/2}$ quasineutron and found reasonable agreement.