Abstract
Gamma-ray cascades in the two- and three-valence-particle nuclei ${}^{134}\mathrm{Sb}$ and ${}^{135}\mathrm{Te}$ have been studied with Gammasphere using a ${}^{248}\mathrm{Cm}$ spontaneous fission source. Isotopic assignments were based in part on coincidences with \ensuremath{\gamma} rays from complementary Rh and Ru fission partners. The ${}^{134}\mathrm{Sb}$ and ${}^{135}\mathrm{Te}$ level schemes have been considerably extended, with placement of many new high-energy \ensuremath{\gamma} rays; delayed \ensuremath{\gamma}-ray coincidences observed across a 0.51-\ensuremath{\mu}s yrast isomer in ${}^{135}\mathrm{Te}$ were especially fruitful. The yrast level spectra of both nuclei are interpreted using empirical nucleon-nucleon interactions and compared with the known yrast excitations of their counterparts ${}^{210}\mathrm{Bi}$ and ${}^{211}\mathrm{Po}.$
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