High-Precision Half-Life Measurements for the Superallowed β+ Emitter C10: Implications for Weak Scalar Currents

M. R. Dunlop et al.
Phys. Rev. Lett. 116, 172501 – Published 28 April 2016

Abstract

Precision measurements of superallowed Fermi β-decay transitions, particularly for the lightest superallowed emitters C10 and O14, set stringent limits on possible scalar current contributions to the weak interaction. In the present work, a discrepancy between recent measurements of the C10 half-life is addressed through two high-precision half-life measurements, via γ-ray photopeak and β counting, that yield consistent results for the C10 half-life of T1/2=19.2969±0.0074s and T1/2=19.3009±0.0017s, respectively. The latter is the most precise superallowed β-decay half-life measurement reported to date and the first to achieve a relative precision below 104. A fit to the world superallowed β-decay data including the C10 half-life measurements reported here yields bF=0.0018±0.0021 (68% C.L.) for the Fierz interference term and CS/CV=+0.0009±0.0011 for the ratio of the weak scalar to vector couplings assuming left-handed neutrinos.

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  • Received 10 February 2016

DOI:https://doi.org/10.1103/PhysRevLett.116.172501

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 116, Iss. 17 — 29 April 2016

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