Decay of a Kπ=21/2-, 17-ms isomer in Ta185

G. J. Lane, G. D. Dracoulis, A. P. Byrne, R. O. Hughes, H. Watanabe, F. G. Kondev, C. J. Chiara, M. P. Carpenter, R. V.F. Janssens, T. Lauritsen, C. J. Lister, E. A. McCutchan, D. Seweryniak, S. Zhu, P. Chowdhury, I. Stefanescu

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    11 Citations (Scopus)


    High-spin states in the neutron-rich nucleus Ta185, populated in the decay of a long-lived, three-quasiparticle state, have been studied using deep-inelastic reactions with Xe136 ions and a W186 target. The lifetime of the isomer has been measured as 17(2) ms and the spin and parity determined to be Kπ=21/2-, leading to a π7/2+[404]ν3/2-[512]11/2+[615] configuration assignment. The isomer decays into the rotational band built upon the π9/2-[514] intrinsic state via K-forbidden transitions with reduced hindrances of 52 and 71. The π9/2-[514] state is itself an isomer with a lifetime of 17(3) ns. It decays via K-allowed E1 transitions to states in the π7/2+[404] band with strengths that are similar to equivalent transitions in the lighter tantalum isotopes.

    Original languageEnglish
    Article number024321
    JournalPhysical Review C - Nuclear Physics
    Issue number2
    Publication statusPublished - 31 Aug 2009


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