Nuclear Structure Studies of GERMANIUM-66 and Krypton 74-80 Isotopes.
In-beam spectroscopic studies of ('66)Ge and ('74)Kr have been made via the heavy ion reactions ('58)Ni(('10)B,pn)('66)Ge and ('60)Ni(('16)O,2n)('74)Kr, by using the Oak Ridge National Laboratory EN tandem Van de Graaff accelerator to produce the boron and oxygen beams. Gamma-gamma and (gamma)((THETA)) measurements have been made with Ge(Li) detectors. New levels have been added to the ('66)Ge decay scheme including yrast states up to tentative (10('+)) level, and spin parity assignments have been made for several levels. In ('74)Kr, the 6('+) yrast level and a possible 8('+) level have been identified. The levels in ('66)Ge and in ('74)Kr have been calculated in the Interacting Boson Model and compared to the observed levels. Two-quasiparticle-plus-rotor model calculations have been performed for ('76,78,80)Kr, as well as for ('66)Ge and compared with experiment. These calculations nicely reproduce the negative parity band beginning at 5('-) which are seen in all these nuclei and the positive parity band in ('80)Kr that begins at 8('+).
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- Physics: Nuclear