The half-lives of Sc-42, V-46, Mn-50 and Co-54

	The half-lives of Sc-42, V-46, Mn-50 and Co-54
	Koslowsky, VT ; Hagberg, E ; Hardy, JC ; Savard, G ; Schmeing, H ; Sharma, KS ; Sun, XJ
刊名	NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
	1997-12-21
卷号	401 页码:289-298
关键词	radioactivity Sc-42[from Ca-42(p,n)] V-46[from Ti-46(p,n)] Mn-50[from Cr-50(p,n)] Co-54[from Fe-54(p,n)] measured T-1/2 4 pi gas counter mass-separated sources rigorously controlled counting conditions and tested analysis algorithms
ISSN号	0168-9002
英文摘要	As part of a broad program to determine ft values for superallowed O+ --> O(+)beta transitions, the half-lives of Sc-42, V-46, Mn-50 and Co-54 have been measured with isotopically pure samples prepared with an on-line isotope separator. Emitted beta(+) particles were observed with a large-solid-angle, high-efficiency, low-background gas proportional counter, from which signals were multiscaled. The counting electronics had a well-defined, non-extendable dead time. As no exact data analysis is possible, three different procedures were compared. The most stringent method involved regression analysis where a common half-life was simultaneously fitted to the individual decay curves of hundreds of samples and their Poisson statistical weights were distorted to reflect dead-rime losses. The analysis procedures were tested on hypothetical decay data that were created by binning a time sequence of events, obtained from interval distributions reflecting the given half-lives and intensities of two decay components, and allowing for series and non-extendible dead times that reflected experimental conditions. On the basis of these tests it is demonstrated that the analysis does not introduce any bias at the 0.01% level. The deduced half-lives are Sc-42: (680.67 +/- 0.28) ms, V-46: (422.57 +/- 0.13) ms, Mn-50: (283.29 +/- 0.08) ms, Co-54: (193.28 +/- 0.07) ms. These results establish important elements in a demanding test of the Electroweak Standard Model.
WOS关键词	JET ION-SOURCE ; CL-34
WOS研究方向	Instruments & Instrumentation ; Nuclear Science & Technology ; Physics ; Spectroscopy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000071039500012
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/35270]
专题	中国科学院近代物理研究所
通讯作者	Koslowsky, VT
作者单位	1.AECL Res, Chalk River Labs, Chalk River, ON K0J 1J0, Canada 2.Univ Manitoba, Winnipeg, MB R3T 2N2, Canada 3.Inst Modern Phys, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Koslowsky, VT,Hagberg, E,Hardy, JC,et al. The half-lives of Sc-42, V-46, Mn-50 and Co-54[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,1997,401:289-298.
APA	Koslowsky, VT.,Hagberg, E.,Hardy, JC.,Savard, G.,Schmeing, H.,...&Sun, XJ.(1997).The half-lives of Sc-42, V-46, Mn-50 and Co-54.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,401,289-298.
MLA	Koslowsky, VT,et al."The half-lives of Sc-42, V-46, Mn-50 and Co-54".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 401(1997):289-298.