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

被引：14

作者：

Dunlop, M. R. ^{[1
]}

Svensson, C. E. ^{[1
]}

Ball, G. C. ^{[2
]}

Grinyer, G. F. ^{[3
]}

Leslie, J. R. ^{[4
]}

Andreoiu, C. ^{[5
]}

Austin, R. A. E. ^{[6
]}

Ballast, T. ^{[2
]}

Bender, P. C. ^{[2
]}

Bildstein, V. ^{[1
]}

Varela, A. Diaz ^{[1
]}

Dunlop, R. ^{[1
]}

Garnsworthy, A. B. ^{[2
]}

Garrett, P. E. ^{[1
]}

Hackman, G. ^{[2
]}

Hadinia, B. ^{[1
]}

Jamieson, D. S. ^{[1
]}

Laffoley, A. T. ^{[1
]}

MacLean, A. D. ^{[1
]}

Miller, D. M. ^{[2
]}

Mills, W. J. ^{[2
]}

Park, J. ^{[2
]}

Radich, A. J. ^{[1
]}

Rajabali, M. M. ^{[2
]}

Rand, E. T. ^{[1
]}

Unsworth, C. ^{[2
]}

Valencik, A. ^{[6
]}

Wang, Z. M. ^{[2
]}

Zganjar, E. F. ^{[7
]}

机构：

[1] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada

[2] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada

[3] CEA DRF CNRS IN2P3, GANIL, Bvd Henri Becquerel, F-14076 Caen, France

[4] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada

[5] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada

[6] St Marys Univ, Dept Phys & Astron, Halifax, NS B3H 3C3, Canada

[7] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 17期

基金：

加拿大自然科学与工程研究理事会;

关键词：

DECAY; LIVES;

D O I：

10.1103/PhysRevLett.116.172501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Precision measurements of superallowed Fermi beta-decay transitions, particularly for the lightest superallowed emitters C-10 and O-14, set stringent limits on possible scalar current contributions to the weak interaction. In the present work, a discrepancy between recent measurements of the C-10 half-life is addressed through two high-precision half-life measurements, via gamma-ray photopeak and beta counting, that yield consistent results for the C-10 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 beta-decay half-life measurement reported to date and the first to achieve a relative precision below 10(-4). A fit to the world superallowed beta-decay data including the C-10 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 = +.0009 +/- 0.0011 for the ratio of the weak scalar to vector couplings assuming left-handed neutrinos.

引用

页数：5

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