Phys. Rev. Lett. 81, 3337–3340 (1998)Observation of Fermi Superallowed β+ Decays in Heavy Odd-Odd, N = Z Nuclei: Evidence for 0+ Ground States in 78Y, 82Nb, and 86TcReceived 10 June 1998; published in the issue dated 19 October 1998 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. The half-lives were measured by correlating β+ decays with the implantation of unambigously identified fragments. The deduced logft 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. The results suggest that these nuclei can extend the mass range used to test the conserved vector current hypothesis of the standard model. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.3337
DOI:
10.1103/PhysRevLett.81.3337
PACS:
23.40.Hc, 21.10.Hw, 21.10.Tg, 27.50.+e
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