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
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.
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页数:6
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