High-precision half-life measurement for the superallowed Fermi β+ emitter Mg22

M.R. Dunlop, C. Natzke,G.C. Ball,J.R. Leslie,G. Hackman, T. Zidar, J. Turko,M. Bowry,P.E. Garrett,A.B. Garnsworthy,V. Bildstein,A. Diaz Varela,Y. Saito, J. Measures, A.D. MacLean,C. Andreoiu,N. Bernier,B. Olaizola,R. Dunlop,J.K. Smith,K.G. Leach, C.E. Svensson, H. Bidaman,B. Jigmeddorj, C. Burbadge,R. Caballero-Folch

PHYSICAL REVIEW C（2017）

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摘要

A high-precision half-life measurement for the superallowed Fermi beta(+) emitter Mg-22 was performed at the TRIUMF-ISAC facility using a 4 pi proportional gas counter. The result of T-1/2 = 3.87400 +/- 0.00079 s is a factor of 3 more precise than the previously adopted world average and resolves a discrepancy between the two previously published Mg-22 half-life measurements.

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