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

J G Narro, C Longour, P H Regan, B Blank, C J Pearson, M Lewitowicz, C Miehe, 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 Greenhalg, R Grzywacz, M Harder, K L Jones, N Kelsall, T Kszczot, R D Page, A T Reed, O Sorlin, R Wadsworth

Research output: Contribution to journalArticlepeer-review

Abstract

The beta (+) -decay half-lives of the neutron-deficient odd-odd N=Z nuclei Rb-74, Y-78, Nb-82, and Tc-86 have been measured following the fragmentation of a primary Mo-92 beam at an energy of 60 MeV per nucleon at the GANIL laboratory, France. This was achieved by correlating beta (+) decays with the implantation of unambiguously identified fragments at the final focus of the LISE3 separator. The deduced log(10)ft(1/2) values are consistent with 0(+)-->0(+). Fermi superallowed transitions, which together with the measured beta (+)-detection efficiencies, suggest T=1, I-pi=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)-
Number of pages9
JournalPhysical Review C
Volume6304
Issue number4
Publication statusPublished - Apr 2001

Keywords

  • RP-PROCESS
  • ISOMERIC STATES
  • BETA+/EC-DECAY
  • ENERGY-LOSS
  • HALF-LIVES
  • FRAGMENTATION
  • IDENTIFICATION
  • STABILITY
  • ISOTOPES
  • POINT

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