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Darby, I. G.; Page, R. D.; Joss, D. T.; Simpson, J.; Bianco, L.; Cooper, R. J.; Eeckhaudt, S.; Erturk, S.; Gall, B.; Grahn, T.; Greenlees, P. T.; Hadinia, Baharak; Jones, P. M.; Judson, D. S.; Julin, R.; Juutinen, S.; Ketelhut, S.; Leino, M.; Leppanen, A. -P; Nyman, M.; Rahkila, P.; Saren, J.; Scholey, C.; Steer, A. N.; Uusitalo, J.; Venhart, M.
Physics letters. B, 01/2011, Volume: 695, Issue: 1-4Journal Article
A new high-spin isomeric state (t(1/2) = 2.8 +/- 0.1 mu s) in Re-160 has been identified. This high-spin isomer is unique in that it only decays by gamma-decay and not by proton or alpha-particle emission as is the case in every other proton emitter between Z = 64 and 80. Shell model calculations indicate how the convergence of the h(9/2) and f(7/2) neutron levels in this region could open up a gamma-decay path from the high-spin isomer to the low-spin ground state of 160Re. providing a natural explanation for this anomalous absence of charged-particle emission. The consequences of these observations for future searches for proton emission from even more exotic nuclei and in-beam spectroscopic studies are considered.
