High-precision half-life determination for 21Na using a 4π gas-proportional counter

被引：5

作者：

Finlay, P. ^{[1
]}

Laffoley, A. T. ^{[2
,5
]}

Ball, G. C. ^{[3
]}

Bender, P. C. ^{[3
,6
]}

Dunlop, M. R. ^{[2
]}

Dunlop, R. ^{[2
]}

Hackman, G. ^{[3
]}

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

MacLean, A. D. ^{[2
]}

Miller, D. ^{[3
,7
]}

Moukaddam, M. ^{[3
,8
]}

Olaizola, B. ^{[2
]}

Severijns, N. ^{[1
]}

Smith, J. K. ^{[3
,9
]}

Southall, D. ^{[3
]}

Svensson, C. E. ^{[2
]}

机构：

[1] Katholieke Univ Leuven, Inst Kern & Stralingsfys, Celestijnenlaan 200D, B-3001 Leuven, Belgium

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

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

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

[5] CNRS, GANIL, CEA, DSM,IN2P3, Bvd Henri Becquerel, F-14076 Caen, France

[6] NSCL, 640 S Shaw Ln, E Lansing, MI 48824 USA

[7] Idaho Natl Lab, Idaho Falls, ID 83415 USA

[8] Univ Surrey, Guildford GU2 5XH, Surrey, England

[9] Reed Coll, 3203 SE Woodstock Blvd, Portland, OR 97202 USA

来源：

PHYSICAL REVIEW C | 2017年 / 96卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

LIVES; DECAYS;

D O I：

10.1103/PhysRevC.96.025501

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A high-precision half-lifemeasurement for the superallowed beta(+) transition between the isospin T = 1/2 mirror nuclei Na-21 and Ne-21 has been performed at the TRIUMF-ISAC radioactive ion beam facility yielding T-1/2 = 22.4506(33) s, a result that is a factor of 4 more precise than the previous world-average half-life for Na-21 and represents the single most precisely determined half-life for a transition between mirror nuclei to date. The contribution to the uncertainty in the Na-21 Ft(mirror) value due to the half-life is now reduced to the level of the nuclear-structure- dependent theoretical corrections, leaving the branching ratio as the dominant experimental uncertainty.

引用

页数：6

共 39 条

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