Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re

C. Thwaites, C. Wheldon, Alison Bruce, P.M. Walker, G.D. Dracoulis, A.P. Byrne, T. Kibédi, F.G. Kondev, C.J. Pearson, C.S. Purry

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Abstract

The nuclear decay of 75179Re has been studied following the 165Ho(18O,4n)179Re and 173Yb(11B,5n)179Re reactions. Previously unobserved multiquasiparticle states have been identified in 75179Re, with highly K-forbidden decays. One of these, with a half-life of 466±15 μs, is the longest-lived high-seniority (>6) isomer yet discovered. This metastable state offers an opportunity to explore K isomerism as protons are added away from the midshell region. In addition, the excitation energies of several previously “floating” bands have been determined. Energies, lifetimes, configuration assignments, and g factors are discussed and compared to predictions of blocked BCS calculations.
Original languageEnglish
JournalPhysical Review C
Volume66
Issue number5
Publication statusPublished - Nov 2002

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    Thwaites, C., Wheldon, C., Bruce, A., Walker, P. M., Dracoulis, G. D., Byrne, A. P., Kibédi, T., Kondev, F. G., Pearson, C. J., & Purry, C. S. (2002). Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re. Physical Review C, 66(5).