Low Energy States of ${}_{31}^{81}G{a}_{50}$ : Elements on the Doubly-Magic Nature of ${}^{78}$Ni

Abstract

Excited levels were attributed to ${}_{31}^{81}$Ga${}_{50}$ for the first time which were fed in the ${\hat{I}}^2$-decay of its mother nucleus ${}^{81}$Zn produced in the fission of ${}^{nat}$U using the ISOL technique. We show that the structure of this nucleus is consistent with that of the less exotic proton-deficient N=50 isotones within the assumption of strong proton Z=28 and neutron N=50 effective shell effects.

4 pages, REVTeX 4, 5 figures (eps format)