Prompt and delayed gamma -ray cascades in doubly magic Sn-132 and its neigh
bor Sn-131 have been studied at Gammasphere using a Cm-248 fission source.
Isotopic assignments of unknown gamma rays were based on coincidences with
known transitions in A = 112-116 Pd fission partners. The yrast level spect
ra of both tin nuclei are interpreted using empirical nucleon-nucleon inter
actions from the Sn-132 and Pb-208 regions. Results include identification
of the (nuf(7/2) h(11/2)(-1))9(+) aligned state in Sn-132 and of extensive
(nuf(7/2)h(11/2)(-2)) (nuf(7/2)d(3/2)(-1)h(11/2)(-1)) and (nuh(11/2)(-1) x
3(-)) multiplets in Sn-131. The previously reported beta (-) decay of an un
usual In-131 high-spin isomer to levels in Sn-131 is also elucidated.