Fast decay of a three-particle isomer in 171Tm

P.M. Walker, R.J. Wood, G.D. Dracoulis, T. Kibédi, R.A. Bark, Alison Bruce, A.P. Byrne, P.M. Davidson, H.M. El-Masri, G.J. Lane, C. Moon, J.N. Orce, F.M. Prados Estevéz, C. Wheldon, A.N. Wilson

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Incomplete-fusion reactions have been used to study high-spin states in 171Tm. Gamma rays and conversion electrons were measured using pulsed-beam conditions for enhanced isomer sensitivity. A Kπ=19/2+, three-quasiparticle isomer was identified, with a half-life of 1.7(2) µs. The faster than expected transition rates from the isomer can be understood as being due to a chance near-degeneracy, with mixing between the isomeric state and the Iπ=19/2+ member of the one-quasiparticle rotational bands to which it decays. The implied mixing matrix element is 12(2) eV.
Original languageEnglish
JournalPhysical Review C
Issue number4
Publication statusPublished - 24 Apr 2009


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