Elsevier

Physics Letters B

Volume 584, Issues 1–2, 25 March 2004, Pages 22-30
Physics Letters B

Identification of yrast high-K isomers in 177Lu and characterisation of 177mLu

https://doi.org/10.1016/j.physletb.2004.01.056Get rights and content
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Abstract

Long-lived high-K states have been identified in 177Lu, including an isomer with τ>10 μs, placed at 3530 keV and associated with the yrast Kπ=39/2, 5-quasiparticle state predicted in multi-quasiparticle-state calculations. The γ-decay of the isomer exposes the rotational band based on the 160-day 23/2 isomer, 177mLu, with band properties which support its proposed configuration. A 90-ns isomer at 1325 keV is associated with the predicted 3-quasiparticle Kπ=25/2+ state while a 5-quasiparticle 33/2+, 902-ns isomer with highly-hindered decays is identified at 2771 keV. Both exhibit rotational bands whose properties are used to support the assigned configurations. The possibility that the Kπ=39/2 isomer found in this work should be identified with a β-decaying isomer, proposed recently to populate the 51-min 37/2 isomer in 177Hf, is discussed in terms of the implied logft values, configuration changes, and hindrances for K-forbidden γ-decays.

PACS

21.10.Re
21.10.Tg
23.20.Lv
27.70.+q

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1

Present address: Physics Department, University of Manchester, Manchester M13 9PL, UK.