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New search for correlated e(+)e(-) pairs in the alpha decay of Am-241
Bernabei, R; Belli, P; Cappella, F; Caracciolo, V; Castellano, S; Cerulli, R; Dai, CJ; d'Angelo, A; Di Marco, A; He, HL; Incicchitti, A; Laubenstein, M; Ma, XH; Montecchia, F; Sheng, XD; Tretyak, VI; Wang, RG; Ye, ZP;戴长江; He HL(何会林); Kuang HH(况浩怀); Ma XH(马欣华); Sheng XD(盛祥东); Ye ZP(叶子飘)
2013
发表期刊EUROPEAN PHYSICAL JOURNAL A
卷号49期号:5页码:64
摘要A new search for production of correlated e(+)e(-) pairs in the alpha decay of Am-241 has been carried out deep underground at the Gran Sasso National Laboratory of the INFN by using pairs of NaI(Tl) detectors of the DAMA/LIBRA set-up. The experimental data show an excess of double coincidences of events with energy around 511 keV in faced pairs of detectors, which are not explained by known side reactions. This measured excess gives a relative activity lambda = (4.70 +/- 0.63) x 10(-9) for the Internal Pair Production (IPP) with respect to the alpha decay of Am-241; this value is of the same order of magnitude as previous determinations. In a conservative approach the upper limit lambda < 5.5 x 10(-9) (90% C.L.) can be derived. It is worth noting that this is the first result on IPP obtained in an underground experiment, and that the lambda value obtained in the present work is independent of the live-time estimate.
学科领域Physics
DOI10.1140/epja/i2013-13064-1
收录类别SCI
WOS记录号WOS:000321430600007
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被引频次:32[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224409
专题粒子天体物理中心
中国科学院高能物理研究所_教育处
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Bernabei, R,Belli, P,Cappella, F,et al. New search for correlated e(+)e(-) pairs in the alpha decay of Am-241[J]. EUROPEAN PHYSICAL JOURNAL A,2013,49(5):64.
APA Bernabei, R.,Belli, P.,Cappella, F.,Caracciolo, V.,Castellano, S.,...&叶子飘.(2013).New search for correlated e(+)e(-) pairs in the alpha decay of Am-241.EUROPEAN PHYSICAL JOURNAL A,49(5),64.
MLA Bernabei, R,et al."New search for correlated e(+)e(-) pairs in the alpha decay of Am-241".EUROPEAN PHYSICAL JOURNAL A 49.5(2013):64.
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