High-Precision Half-Life Measurement for the Superallowed β+ Emitter 26Alm

被引：35

作者：

Finlay, P. ^{[1
]}

Ettenauer, S. ^{[2
,3
]}

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

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

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

Andreoiu, C. ^{[5
]}

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

Bandyopadhyay, D. ^{[2
]}

Cross, D. S. ^{[5
]}

Demand, G. ^{[1
,4
]}

Djongolov, M. ^{[2
]}

Garrett, P. E. ^{[1
,2
]}

Green, K. L. ^{[1
]}

Grinyer, G. F. ^{[7
]}

Hackman, G. ^{[2
]}

Leach, K. G. ^{[1
]}

Pearson, C. J. ^{[2
]}

Phillips, A. A. ^{[1
]}

Sumithrarachchi, C. S. ^{[1
]}

Triambak, S. ^{[1
,2
]}

Williams, S. J. ^{[2
]}

机构：

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

[2] TRIUMF, Vancouver, BC V6T 2A3, Canada

[3] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada

[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] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

ISOSPIN-MIXING CORRECTIONS; DECAY; TESTS;

D O I：

10.1103/PhysRevLett.106.032501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A high-precision half-life measurement for the superallowed beta(+) emitter Al-26(m) was performed at the TRIUMF-ISAC radioactive ion beam facility yielding T-1/2 = 6346.54 +/- 0.46(stat) +/- 0.60(syst) ms, consistent with, but 2.5 times more precise than, the previous world average. The Al-26(m) half-life and ft value, 3037.53(61) s, are now the most precisely determined for any superallowed beta decay. Combined with recent theoretical corrections for isospin-symmetry-breaking and radiative effects, the corrected Ft value for Al-26(m), 3073.0(12) s, sets a new benchmark for the high-precision superallowed Fermi beta-decay studies used to test the conserved vector current hypothesis and determine the V-ud element of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.

引用

页数：4

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