Search for time dependence of the 137Cs decay constant

被引：39
作者：
Bellotti, E. [2 ,3 ]
Broggini, C. [1 ]
Di Carlo, G. [4 ]
Laubenstein, M. [4 ]
Menegazzo, R. [1 ]
机构：
[1] Ist Nazl Fis Nucl, Sez Padova, Padua, Italy
[2] Univ Milano Bicocca, Milan, Italy
[3] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[4] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, Assergi, AQ, Italy
来源：
PHYSICS LETTERS B | 2012年 / 710卷 / 01期
关键词：
Radioactivity; Beta decay; Gran Sasso; BETA-DECAY; HALF-LIFE;
D O I：
10.1016/j.physletb.2012.02.083
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Starting from June 2011, the activity of a Cs-137 source has been measured by means of a HPGe detector installed deep underground in the Gran Sasso Laboratory. Over 5100 hourly recorded energy spectra have been collected in 217 days. These data allowed the search for time variations of the decay constant with periods from a few hours to 1 year. No signal with amplitude larger than 9.6.10(-5) at 95% C.L. has been detected. These limits are more than one order of magnitude lower than the values on the oscillation amplitude reported in literature. In particular, for 1 year period an oscillation amplitude larger than 8.5.10(-5) has been excluded at 95% C.L., independently of the phase. The same data give a value of 29.96 +/- 0.08 years for the Cs-137 half-life, in good agreement with the world mean value of 30.05 +/- 0.08 years. (C) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：114 / 117
页数：4
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