Structure of odd ${}^{79,81,83}$Se isotopes with proton and neutron excitations across $Z=28$ AND $N=40$

The recently measured experimental data of ${}^{79,81,83}$Se isotopes have been interpreted in terms of shell model calculations. The calculations have been performed in $f_{5\mathrm{/}2}p{g}_{9\mathrm{/}2}$ space with the recently derived interactions, namely with JUN45 and jj44b. To study the importance of the proton excitations across the $Z=28$ shell in this region. We have also performed calculation in $fp{g}_{9\mathrm{/}2}$ valence space using an $fpg$ effective interaction with ${}^{48}$Ca core and imposing a truncation. Excitation energies, $B(2)$ values, quadrupole moments and magnetic moments are compared with experimental data when available. Present study reveals the importance of proton excitations across the $Z=28$ shell for predicting quadrupole and magnetic moments.