Structure of multi-quasiparticle isomers in the region of 177Lu
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Dracoulis, G. D.
Kondev, F. G.
Lane, G. J.
Byrne, A. P.
Kibédi, T.
Ahmad, I.
Carpenter, M. P.
Freeman, S. J.
Janssens, R. V.F.
Hammond, N. J.
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Abstract
High-K states in the region of 177Lu have been studied using multi-nucleon transfer reactions with 136Xe beams and Gammasphere. Results include identification of the predicted 5-quasiparticle Kπ = 39/2 - isomer in 177Lu, a 7-quasiparticle K π = 49/2 + isomer in 179Ta with an anomalously fast decay, and numerous other examples in a range of Yb close to stability. The results are discussed in the context of the expectations for multi-quasiparticle states near Z = 72 and the factors which may both govern isomer formation and also give an insight into K-purity, specifically chance degeneracies, and statistical mixing above the yrast line.
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NUCLEI AT THE LIMITS
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