Phys. Rev. C 63, 044307 (2001) [9 pages]Fermi superallowed β+ decays and T=1 ground states of heavy odd-odd N=Z nucleiReceived 9 June 2000; revised 23 August 2000; published 6 March 2001 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.63.044307
DOI:
10.1103/PhysRevC.63.044307
PACS:
21.10.-k, 23.40.-s, 25.70.-z, 27.50.+e
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