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Dunlop MR, Svensson CE, Ball GC, et al. High-Precision Half-Life Measurements for the Superallowed β^{+} Emitter ^{10}C: Implications for Weak Scalar Currents. Phys Rev Lett. 2016;116(17):172501doi: 10.1103/PhysRevLett.116.172501.
Dunlop, M. R., Svensson, C. E., Ball, G. C., Grinyer, G. F., Leslie, J. R., Andreoiu, C., Austin, R. A., Ballast, T., Bender, P. C., Bildstein, V., Diaz Varela, A., Dunlop, R., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Hadinia, B., Jamieson, D. S., Laffoley, A. T., MacLean, A. D., Miller, D. M., Mills, W. J., Park, J., Radich, A. J., Rajabali, M. M., Rand, E. T., Unsworth, C., Valencik, A., Wang, Z. M., & Zganjar, E. F. (2016). High-Precision Half-Life Measurements for the Superallowed β^{+} Emitter ^{10}C: Implications for Weak Scalar Currents. Physical review letters, 116(17), 172501. https://doi.org/10.1103/PhysRevLett.116.172501
Dunlop, M R, et al. "High-Precision Half-Life Measurements for the Superallowed β^{+} Emitter ^{10}C: Implications for Weak Scalar Currents." Physical review letters vol. 116,17 (2016): 172501. doi: https://doi.org/10.1103/PhysRevLett.116.172501
Dunlop MR, Svensson CE, Ball GC, Grinyer GF, Leslie JR, Andreoiu C, Austin RA, Ballast T, Bender PC, Bildstein V, Diaz Varela A, Dunlop R, Garnsworthy AB, Garrett PE, Hackman G, Hadinia B, Jamieson DS, Laffoley AT, MacLean AD, Miller DM, Mills WJ, Park J, Radich AJ, Rajabali MM, Rand ET, Unsworth C, Valencik A, Wang ZM, Zganjar EF. High-Precision Half-Life Measurements for the Superallowed β^{+} Emitter ^{10}C: Implications for Weak Scalar Currents. Phys Rev Lett. 2016 Apr 29;116(17):172501. doi: 10.1103/PhysRevLett.116.172501. Epub 2016 Apr 28. PMID: 27176517.
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Phys Rev Lett. 2016 Apr 29;116(17):172501. doi: 10.1103/PhysRevLett.116.172501. Epub 2016 Apr 28.

High-Precision Half-Life Measurements for the Superallowed β^{+} Emitter ^{10}C: Implications for Weak Scalar Currents.

Physical review letters

M R Dunlop, C E Svensson, G C Ball, G F Grinyer, J R Leslie, C Andreoiu, R A E Austin, T Ballast, P C Bender, V Bildstein, A Diaz Varela, R Dunlop, A B Garnsworthy, P E Garrett, G Hackman, B Hadinia, D S Jamieson, A T Laffoley, A D MacLean, D M Miller, W J Mills, J Park, A J Radich, M M Rajabali, E T Rand, C Unsworth, A Valencik, Z M Wang, E F Zganjar

Affiliations

  1. Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
  2. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  3. GANIL, CEA/DRF-CNRS/IN2P3, Bvd Henri Becquerel, 14076 Caen, France.
  4. Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
  5. Department of Chemistry, Simon Fraser University, Burnaby, British Colombia V5A 1S6, Canada.
  6. Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada.
  7. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, 70803, USA.

PMID: 27176517 DOI: 10.1103/PhysRevLett.116.172501

Abstract

Precision measurements of superallowed Fermi β-decay transitions, particularly for the lightest superallowed emitters ^{10}C and ^{14}O, set stringent limits on possible scalar current contributions to the weak interaction. In the present work, a discrepancy between recent measurements of the ^{10}C half-life is addressed through two high-precision half-life measurements, via γ-ray photopeak and β counting, that yield consistent results for the ^{10}C half-life of T_{1/2}=19.2969±0.0074  s and T_{1/2}=19.3009±0.0017  s, 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 10^{-4}. A fit to the world superallowed β-decay data including the ^{10}C half-life measurements reported here yields b_{F}=-0.0018±0.0021 (68% C.L.) for the Fierz interference term and C_{S}/C_{V}=+0.0009±0.0011 for the ratio of the weak scalar to vector couplings assuming left-handed neutrinos.

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