Magic Nucleus Sn-132 And N=81 Isotones Sn-131, Sb-132, Te-133

Excitations of few-valence-particle nuclei around doubly-magic Sn-132 have been investigated by analysis of fission product gamma-ray data measured at Gammasphere using a 248 CM fission source. Isotopic assignments of unknown gamma-ray cascades were based on coincidence with known transitions in Pd, Rh, and Ru fission partners. Here, the yrast level spectra of the N=81, 82 nuclei Sn-131, Sn-132, Sb-132, and Te-133 are interpreted using empirical nucleon-nucleon interactions from both 132Sn and Pb-208 regions. A previously reported beta(-) decay of an unusual In-131 high-spin isomer to levels in Sn-131 is also discussed.