Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re
Thwaites, C., Wheldon, C., Bruce, A.M., Walker, P.M., Dracoulis, G.D., Byrne, A.P., Kibédi, T., Kondev, F.G., Pearson, C.J. and 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). ISSN 0556-2813Full text not available from this repository.
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.
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