Precise half-life measurement of the superallowed β+ emitter 38Ca

被引：21
|
作者：
Park, H. I. [1 ]
Hardy, J. C. [1 ]
Iacob, V. E. [1 ]
Banu, A. [1 ]
Chen, L. [1 ]
Golovko, V. V. [1 ]
Goodwin, J. [1 ]
Horvat, V. [1 ]
Nica, N. [1 ]
Simmons, E. [1 ]
Trache, L. [1 ]
Tribble, R. E. [1 ]
机构：
[1] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77845 USA
来源：
PHYSICAL REVIEW C | 2011年 / 84卷 / 06期
关键词：
POSITRON DECAYS;
D O I：
10.1103/PhysRevC.84.065502
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：
The half-life of Ca-38, a T-Z = -1 superallowed 0(+) -> 0(+) beta(+) emitter, has been measured to be 443.77(36) ms. In our experiment, pure sources of 38Ca were produced and the decay positrons were detected in a high-efficiency 4 pi proportional gas counter. Since the beta(+) decay of Ca-38 feeds K-38(m), which is itself a superallowed beta(+) emitter, the data were analyzed as a linked parent-daughter decay. Our result, with a precision of 0.08%, is a factor of 5 improvement on the best previous result.
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页数：8
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