High-precision half-life determination for the superallowed {beta}{sup +} emitter {sup 62}Ga
- Department of Physics, University of Guelph, Guelph, Ontario, N1G 2W1 (Canada)
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)
- Department of Physics, Queen's University, Kingston, Ontario, K7L 3N6 (Canada)
- Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3 (Canada)
The half-life of the superallowed {beta}{sup +} emitter {sup 62}Ga has been measured at TRIUMF's Isotope Separator and Accelerator facility using a fast-tape-transport system and 4{pi} continuous-flow gas proportional counter to detect the positrons from the decay of {sup 62}Ga to the daughter {sup 62}Zn. The result, T{sub 1/2}=116.100{+-}0.025 ms, represents the most precise measurement to date (0.022%) for any superallowed {beta}-decay half-life. When combined with six previous measurements of the {sup 62}Ga half-life, a new world average of T{sub 1/2}=116.121{+-}0.021 ms is obtained. This new half-life measurement results in a 20% improvement in the precision of the {sup 62}Ga superallowed ft value while reducing its mean by 0.9{sigma} to ft=3074.3(12) s. The impact of this half-life measurement on precision tests of the CVC hypothesis and isospin symmetry breaking corrections for A{>=}62 superallowed decays is discussed.
- OSTI ID:
- 21068078
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 77, Issue 1; Other Information: DOI: 10.1103/PhysRevC.77.015501; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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