Elsevier

Physics Letters B

Volume 408, Issues 1–4, 11 September 1997, Pages 42-46
Physics Letters B

K-forbidden transitions from multi-quasiparticle states

https://doi.org/10.1016/S0370-2693(97)00819-8Get rights and content

Abstract

Four-quasiparticle, Kπ = 12+ states in 172Hf and 178W, with half-lives less than 2 ns, are found to decay to their respective Kπ = 0+ ground-state bands, in competition with transitions to intermediate-K, two-quasiparticle structures. All decay transitions are weakly hindered. When taken together with other K-isomer decay rates, an overall trend of decreasing hindrance with increasing excitation energy is evident. Estimates based on density-of-states considerations approximately reproduce the trend of the data, but also indicate the need to include other K-mixing effects.

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    [email protected]; fax: -44-1483-259501

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    Present address: Department of Physics, Florida State University, Tallahassee, FL 32306, USA.

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