High-precision branching ratio measurement for the superallowed β+ emitter 62Ga

被引：29

作者：

Finlay, P. ^{[1
]}

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

Leslie, J. R. ^{[3
]}

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

Towner, I. S. ^{[3
]}

Austin, R. A. E. ^{[4
]}

Bandyopadhyay, D. ^{[1
]}

Chaffey, A. ^{[4
]}

Chakrawarthy, R. S. ^{[2
]}

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

Grinyer, G. F. ^{[1
]}

Hackman, G. ^{[2
]}

Hyland, B. ^{[1
]}

Kanungo, R. ^{[2
]}

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

Mattoon, C. M. ^{[5
]}

Morton, A. C. ^{[2
]}

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

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

Ressler, J. J. ^{[6
]}

Sarazin, F. ^{[5
]}

Savajols, H. ^{[2
]}

Schumaker, M. A. ^{[1
]}

Wong, J. ^{[1
]}

机构：

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

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

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

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

[5] Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA

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

来源：

PHYSICAL REVIEW C | 2008年 / 78卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevC.78.025502

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 branching ratio measurement for the superallowed beta(+) decay of Ga-62 was performed at the Isotope Separator and Accelerator (ISAC) radioactive ion beam facility. The 8 pi spectrometer, an array of 20 high-purity germanium detectors, was employed to detect the gamma rays emitted following Gamow-Teller and nonanalog Fermi beta(+) decays of Ga-62, and the SCEPTAR plastic scintillator array was used to detect the emitted beta particles. Thirty gamma rays were identified following Ga-62 decay, establishing the superallowed branching ratio to be 99.858(8)%. Combined with the world-average half-life and a recent high-precision Q-value measurement for Ga-62, this branching ratio yields an ft value of 3074.3 +/- 1.1 s, making Ga-62 among the most precisely determined superallowed ft values. Comparison between the superallowed ft value determined in this work and the world-average corrected (Ft) over bar value allows the large nuclear-structure-dependent correction for Ga-62 decay to be experimentally determined from the CVC hypothesis to better than 7% of its own value, the most precise experimental determination for any superallowed emitter. These results provide a benchmark for the refinement of the theoretical description of isospin-symmertry breaking in A >= 62 superallowed decays.

引用

页数：13

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