Decay of a 19(-) isomeric state in Lu-156

Lewis, MC, Parr, E, Page, RD ORCID: 0009-0009-7062-711X, McPeake, C, Joss, DT ORCID: 0000-0001-5763-8767, Ali, FA, Auranen, K, Briscoe, AD, Capponi, L, Grahn, T
et al (show 30 more authors) (2018) Decay of a 19(-) isomeric state in Lu-156. PHYSICAL REVIEW C, 98 (2). 024302-.

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A multiparticle spin-trap isomeric state having a half-life of 179(4) ns and lying 2601 keV above the yrast 10+ state in Lu156 has been discovered. The Lu156 nuclei were produced by bombarding isotopically enriched Cd106 targets with beams of Ni58 ions, separated in flight using the gas-filled separator RITU and their decays were measured using the GREAT spectrometer. Analysis of the main decay path that populates yrast states observed previously suggests a spin-parity assignment of 19- for the isomeric state, which is consistent with isomeric states identified in the N = 85 isotones. Comparison with other decay paths in Lu156 indicates that the [πh11/2-1 - νh9/2]10+ state at the bottom of the yrast sequence is likely to be the α-decaying isomeric state, with the [πh11/2-1 - νf7/2]9+ state lying 62 keV above it. The relative ordering of the lowest-lying 9+ and 10+ states is inverted in Lu156 compared with its odd-odd isotones.

Item Type: Article
Uncontrolled Keywords: electromagnetic transitions, isomer decays, nuclear structure decays
Depositing User: Symplectic Admin
Date Deposited: 29 Aug 2018 06:10
Last Modified: 15 Mar 2024 00:44
DOI: 10.1103/PhysRevC.98.024302
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