Precise β branching-ratio measurement for the 0+ → 0+ superallowed decay of 34Ar

Iacob, V. E.; Hardy, J. C.; Park, H. I.; Bencomo, M.; Chen, L.; Horvat, V.; Nica, N.; Roeder, B. T.; Saastamoinen, A.; Towner, I. S.

doi:10.1103/physrevc.101.045501

Precise β branching-ratio measurement for the 0⁺ → 0⁺ superallowed decay of ³⁴Ar

Journal Article · Tue Apr 07 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.101.045501· OSTI ID:1780883

Iacob, V. E. ^[1]; ^[2]; Park, H. I. ^[2]; Bencomo, M. ^[2]; Chen, L. ^[2]; Horvat, V. ^[2]; Nica, N. ^[2]; Roeder, B. T. ^[2]; Saastamoinen, A. ^[2]; Towner, I. S. ^[2]

Texas A & M Univ., College Station, TX (United States); Cyclotron Institute, Texas A&M University, TX (United States)
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, δ_C, 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 V_ud, 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 δ_C.

View Accepted Manuscript (DOE)

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

OSTI ID:: 1780883

Alternate ID(s):: OSTI ID: 1632912

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 101; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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