Persistence of K Isomerism in the N = 104 Isotones: Observations of a High-seniority Isomer 179 75 Re
Date
2002
Authors
Thwaites, C.
Wheldon, C
Bruce, A M
Walker, Philip M
Dracoulis, George
Byrne, Aidan
Kibedi, Tibor
Kondev, F.
Pearson, C J
Purry, C
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Volume Title
Publisher
American Physical Society
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.
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Source
Physical Review C: Nuclear Physics
Type
Journal article