Fermi superallowed β+ decays and T=1 ground states of heavy odd-odd N=Z nuclei

J. Garcés Narro*, C. Longour, P. H. Regan, B. Blank, C. J. Pearson, M. Lewitowicz, C. Miehé, W. Gelletly, D. Appelbe, L. Axelsson, A. M. Bruce, W. N. Catford, C. Chandler, R. M. Clark, D. M. Cullen, S. Czajkowski, J. M. Daugas, P. Dessagne, A. Fleury, L. FranklandJ. Giovinazzo, B. Greenhalgh, R. Grzywacz, M. Harder, K. L. Jones, N. Kelsall, T. Kszczot, R. D. Page, A. T. Reed, O. Sorlin, R. Wadsworth

*Corresponding author for this work

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The β+-decay half-lives of the neutron-deficient odd-odd N=Z nuclei 74Rb, 78Y, 82Nb, and 86Tc have been measured following the fragmentation of a primary 92Mo beam at an energy of 60 MeV per nucleon at the GANIL laboratory, France. This was achieved by correlating β+ decays with the implantation of unambiguously identified fragments at the final focus of the LISE3 separator. The deduced log10ft1/2 values are consistent with 0+→0+, Fermi superallowed transitions, which together with the measured β+-detection efficiencies, suggest T=1, Iπ=0+ ground states for these odd-odd N=Z nuclei. These data represent the heaviest N=Z systems for which Fermi superallowed decays have been established.

Original languageEnglish
Article number044307
Pages (from-to)443071-443079
Number of pages9
JournalPhysical Review C - Nuclear Physics
Issue number4
Publication statusPublished - 1 Jan 2001

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