Abstract
A new high-spin isomeric state (t1/2=2.8±0.1 μs) in 160Re has been identified. This high-spin isomer is unique in that it only decays by γ-decay and not by proton or α-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 h9/2 and f7/2 neutron levels in this region could open up a γ-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.
Highlights
Shell model calculations indicate how the convergence of the h9/2 and f7/2 neutron levels in this region could open up a γ -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
A new high-spin isomeric state (t1/2 = 2.8 ± 0.1 μs) in 160Re has been identified
The structure of nuclei in this region is dominated at low excitation energy by valence neutrons in the νf7/2 and νh9/2 orbitals and protons in the π s1/2, π d3/2 and π h11/2 orbitals [14,15]
Summary
Shell model calculations indicate how the convergence of the h9/2 and f7/2 neutron levels in this region could open up a γ -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. Odd–odd nuclei γ -decays between the π h11/2 and the π s1/2 or the π d3/2 states would be very slow owing to the large spin difference, so charged particle emission dominates.
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