Excited states in ${}^{111}\mathrm{Te}$ have been studied using the $4pn$ evaporation channel from the ${}^{58}\mathrm{Ni}{+}^{58}\mathrm{Ni}$ reaction at a beam energy of 250 MeV. A thin-target experiment was carried out using GAMMASPHERE coupled with the MICROBALL charged-particle detector array and an array of neutron detectors. A complementary thick-target experiment was performed with the Stony Brook six-Ge-detector array in order to measure the lifetime of an ${11/2}^{-}$ isomer observed in the GAMMASPHERE data. The structure of ${}^{111}\mathrm{Te}$ at low spin is dominated by the yrast $\nu h_{11/2}$ band, although a band assigned to the $\nu {(g}_{7/2}{d}_{5/2})$ configuration is also observed. Four collective bands have been found at higher spins. Experimental results are compared to the odd-$A$ Te systematics and to core-quasiparticle and total Routhian surface calculations.

• Received 19 October 1999

DOI:https://doi.org/10.1103/PhysRevC.61.034308