Study of the N=50 major shell effect close to ${}^{78}$Ni : First evidence of a weak coupling structure in ${}^{83}\_32$Ge$\_51$ and three-proton configuration states in ${}^{81}\_31$Ga$\_50$

D. Verney, F. Ibrahim, O. Perru +17

New levels were attributed to ${}^{81}\_31$Ga$\_50$ and ${}^{83}\_32$Ge$\_51$ which were fed by the $\beta$-decay of their respective mother nuclei ${}^{81}\_30$Zn$\_51$ and $^{8…