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 0556-2813
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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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