Normal and anomalous K-hindered decays from four-quasiparticle isomers in 176Lu

T. R. McGoram*, G. D. Dracoulis, T. Kibédi, A. P. Byrne, R. A. Bark, A. M. Baxter, S. M. Mullins

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    29 Citations (Scopus)


    Two four-quasiparticle isomers, with Kπ = 12+ and (14+) and mean lives of 450(100) ns and 58(5) μs, have been identified in 176Lu, at excitation energies of 1515 and 1588 keV, respectively. The 12+ isomer exhibits a large number of K-forbidden decay branches, populating the rotational sequences based on the Kπ = 7- ground state, two Kπ = 8+ states, and a Kπ = 4+ state from the ν{7/2-[514]}⊗π{1/2-[541]} configuration. Most branches have decay rates that are consistent with normal K-hindrances except for the branch to the Kπ = 4+ band. It has an anomalously low hindrance factor, which is attributed to two-state mixing due to a near-degeneracy between the 12+ isomer and the 12+ member of this band. The implied mixing matrix element has a value of only 5 eV, showing explicitly that very small mixing matrix elements may be responsible for anomalous K-hindered decays.

    Original languageEnglish
    Article number031303
    Pages (from-to)313031-313035
    Number of pages5
    JournalPhysical Review C - Nuclear Physics
    Issue number3
    Publication statusPublished - Sept 2000


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