The first evidence for excited states in ${}_{}{}^{101}{}_{}{}^{}\mathrm{In}$ is presented. ${}_{}{}^{101}{}_{}{}^{}\mathrm{In}$ is the lightest In isotope observed in an in-beam experiment. Two γ-ray transitions at 1309 and 341 keV, respectively, are strong candidates for a cascade to the ground state in this nucleus. In shell-model terms it has one proton hole and two neutron particles outside the double shell closure at ${}_{}{}^{100}{}_{}{}^{}\mathrm{Sn}$. New ideas for improving the peak to background ratio in certain γ-ray spectra from fusion evaporation reactions are introduced. © 1996 The American Physical Society.

• Received 8 December 1995

DOI:https://doi.org/10.1103/PhysRevC.53.1955