Precise branching ratio measurement for the superallowed β+ decay of 26Si: Completion of a second mirror pair

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

doi:10.1103/physrevc.100.015503

Title: Precise branching ratio measurement for the superallowed β+ decay of ²⁶Si: Completion of a second mirror pair

Journal Article · 26 July 2019 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.100.015503 · OSTI ID:1614589

Bencomo, M. ^[1];

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

Texas A & M Univ., College Station, TX (United States)

As part of a continuing effort to test the unitarity of the Cabbibo-Kobayashi-Maskawa matrix, we have measured the branching ratio for the superallowed 0⁺ → 0⁺ β⁺-decay transition from ²⁶Si to be 0.7569(14), a result with 0.18% relative precision. With this result, the ft value for the transition is now established with comparable precision to the well-known superallowed transitions currently used in the determination of V_ud. Furthermore, it also completes a second pair of mirror superallowed transitions, ²⁶Si → ^26mAl and ^26mAl → ²⁶Mg, the ratio of whose measured ft values provides a sensitive test of the method used to calculate the isospin-symmetry-breaking correction δ_C needed to determine V_ud. Like the previously measured ratio for the mass-38 mirror pair, the new result agrees well with the calculation based on Woods-Saxon radial wave functions and strengthens the case for rejecting the calculation that uses Hartree-Fock radial functions.

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Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: FG03-93ER40773

OSTI ID:: 1614589

Alternate ID(s):: OSTI ID: 1545417

Journal Information:: Physical Review C, Vol. 100, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Precise branching ratio measurement for the superallowed β+ decay of ²⁶Si: Completion of a second mirror pair