Structure of two-, four-, and six-quasiparticle isomers in 174Yb and K-forbidden decays

G. D. Dracoulis*, G. J. Lane, F. G. Kondev, A. P. Byrne, T. Kibédi, H. Watanabe, I. Ahmad, M. P. Carpenter, S. J. Freeman, R. V.F. Janssens, N. J. Hammond, T. Lauritsen, C. J. Lister, G. Mukherjee, D. Seweryniak, P. Chowdhury, S. K. Tandel

*Corresponding author for this work

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    The stable nucleus 174Yb has been studied using deep-inelastic reactions and time-correlated γ-ray spectroscopy. New intrinsic states assigned include a 370-ns isomer at 1765 keV, which we associate with a predicted Kπ = 7- two-quasineutron configuration. Analysis of the alignment and in-band properties of its rotational band, identified using time-correlated coincidences, allows characterization of the configuration. The properties of a newly identified rotational band built on the known 830-μs isomer at 1518 keV support the 6+, 2-quasineutron configuration assignment proposed previously. The 6+ band is fed by a four-quasiparticle, Kπ = 14+ isomer at 3699 keV and several higher multiquasiparticle states, including a six-quasiparticle isomer at 6147 keV with K = (22,23). The results are discussed in terms of the states predicted on the basis of multiquasiparticle calculations. The anomalously fast K-forbidden transition strengths from the 14+ isomer are attributed to either K mixing in the neutron configuration or to random mixing in the high-level-density region. The 7- isomer decays are not abnormal, whereas the very hindered E2 transition from the 6+ isomer to the ground-state band remains unexplained.

    Original languageEnglish
    Article number044326
    JournalPhysical Review C - Nuclear Physics
    Issue number4
    Publication statusPublished - Apr 2005


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