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

Abstract

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
Volume96
Issue number2
DOIs
StatePublished - Aug 9 2017

Funding

The authors would like to thank the GPS Collaboration and the TRIUMF-ISAC operators and target group. This work was supported by FWO-Vlaanderen (Belgium) and the Natural Sciences and Engineering Research Council of Canada (NSERC). C.E.S. acknowledges support from the Canada Research Chairs program. TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada (NRC).

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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