2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201557Excited levels were attributed to $^{81}_{31}$Ga$_{50}$ for the first time which were fed in the $β$-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)Nuclear Experimenttext