Magic nucleus 132Sn and its one-neutron-hole neighbor 131Sn -: art. no. 062502

Prompt and delayed gamma -ray cascades in doubly magic Sn-132 and its neighbor 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 spectra of both tin nuclei are interpreted using empirical nucleon-nucleon interactions 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 unusual In-131 high-spin isomer to levels in Sn-131 is also elucidated.