Precise β branching-ratio measurement for the 0+ → 0+ superallowed decay of 34Ar
- Texas A & M Univ., College Station, TX (United States)
We have measured the branching ratio for the superallowed 0+ → 0+ β transition from 34Ar to be 0.9448(8), and determined its ft value to be 3058.1(28) s, a result with ±0.09% precision, which is a factor of three improvement over the previous result based on current world data. The ft-value ratio for the mirror pair of superallowed transitions 34Ar → 34Cl and 34Cl → 34S, becomes the most precise yet measured and, in a sensitive test of the method used to calculate the isospin-symmetry-breaking correction, δC, it agrees well with the ratio as calculated with Woods-Saxon radial wave functions. This confirms the method used in the most recent survey of superallowed decays to extract Vud, the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix. Additionally, our branching-ratio results for the four observed Gamow-Teller branches to 1+ states in 34Cl are shown to agree well with shell-model calculations based on the same effective interactions that were used in the determination of δC.
- Research Organization:
- Texas A & M Univ., College Station, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); Welch Foundation
- Grant/Contract Number:
- FG02-93ER40773; A-1397; FG03-93ER40773
- OSTI ID:
- 1780883
- Alternate ID(s):
- OSTI ID: 1632912
- Journal Information:
- Physical Review C, Vol. 101, Issue 4; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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