Decay of the high-spin isomer in Re-160: Changing single-particle structure beyond the proton drip line

作者：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 B; 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

来源：Physics Letters B, 2011, 695(1-4): 78-81.

DOI：10.1016/j.physletb.2010.10.052

• NUCLEAR REACTIONS Ni-58+Cd-106 at 290
• 300 MeV beam energy, enriched targets
• Gas-filled recoil separator, Si and Ge strip detectors
• Measured E gamma, t1/2

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.

• 出版日期2011-1-10