Precise half-life measurements for the superallowed beta(+) emitters Ar-34 and Cl-34
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To contribute meaningfully to any test of the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the measured ft value of a superallowed 0+0+ + transition must be obtained to a precision of 0.1% or better. We have determined the half-life of the superallowed emitter Ar34 to be 843.8(4)ms; the quoted precision, 0.05%, is a factor of five improvement on the best previous measurement and meets this demanding requirement. Our measurement employed a high-efficiency gas counter, which was sensitive to positrons from both Ar34 and its daughter Cl34. We achieved the required precision on Ar34 by analyzing the parent-daughter composite decay with a new fitting technique. We also obtained an improved half-life for Cl34 of 1.5268(5) s, which has 0.03% precision and is a factor of two improvement on previous results. As a by-product of these measurements, we determined the half-life of Ar35 to be 1.7754(11) s. 2006 The American Physical Society.
author list (cited authors)
Iacob, V. E., Hardy, J. C., Brinkley, J. F., Gagliardi, C. A., Mayes, V. E., Nica, N., ... Tribble, R. E.
complete list of authors
Iacob, VE||Hardy, JC||Brinkley, JF||Gagliardi, CA||Mayes, VE||Nica, N||Sanchez-Vega, M||Tabacaru, G||Trache, L||Tribble, RE