High-precision half-life determination for Na 21 using a 4π gas-proportional counter

P. Finlay, A. T. Laffoley, G. C. Ball, P. C. Bender, M. R. Dunlop, R. Dunlop, G. Hackman, J. R. Leslie, A. D. Maclean, D. Miller, M. Moukaddam, B. Olaizola, N. Severijns, J. K. Smith, D. Southall, C. E. Svensson

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4 Scopus citations


A high-precision half-life measurement for the superallowed β+ transition between the isospin T=1/2 mirror nuclei Na21 and Ne21 has been performed at the TRIUMF-ISAC radioactive ion beam facility yielding T1/2=22.4506(33) s, a result that is a factor of 4 more precise than the previous world-average half-life for Na21 and represents the single most precisely determined half-life for a transition between mirror nuclei to date. The contribution to the uncertainty in the Na21 Ftmirror value due to the half-life is now reduced to the level of the nuclear-structure-dependent theoretical corrections, leaving the branching ratio as the dominant experimental uncertainty.

Original languageEnglish (US)
Article number025501
JournalPhysical Review C
Issue number2
StatePublished - Aug 9 2017
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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