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arXiv 1303.4080physics.ins-detnucl-ex
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大质量ZnSe测辐射热计搜寻稀有事件的性能

Performances of a large mass ZnSe bolometer to search for rare events

J. W. Beeman, F. Bellini, L. Cardani, N. Casali, I. Dafinei, S. Di Domizio, F. Ferroni, L. Gironi, A. Giuliani, S. Nagorny, F. Orio, L. Pattavina, G. Pessina, G… 展开作者

J. W. Beeman, F. Bellini, L. Cardani, N. Casali, I. Dafinei, S. Di Domizio, F. Ferroni, L. Gironi, A. Giuliani, S. Nagorny, F. Orio, L. Pattavina, G. Pessina, G. Piperno, S. Pirro, E. Previtali, C. Rusconi, C. Tomei, M. Vignati

摘要:

ZnSe闪烁测辐射热计是LUCIFER实验的基线选择,其目的是观察82 Se的无中微子双β衰变。热量和闪烁信号的独立读出允许识别和拒绝α粒子相互作用,这是测辐射热探测器的主要背景源。在本文中,我们报告的ZnSe晶体内的LUCIFER R&D操作的性能。我们测量了闪烁产额、能量分辨率和能量区域中的背景,在该能量区域中,预期来自82 Se的无中微子双β衰变的信号具有9.4 kg x天的暴露。利用新开发的分析算法,我们改进了对α事件的拒绝,并且我们估计了通过热信号和光信号的组合获得的能量分辨率的增加。我们第一次测量了核反冲发出的光,发现它与零相容。我们的结论是,从β/γ相互作用的WIMPs能量区域的核反冲的歧视是可能的,但低噪声的光探测器是必要的。

英文摘要:

Scintillating bolometers of ZnSe are the baseline choice of the LUCIFER experiment, whose aim is to observe the neutrinoless double beta decay of 82Se. The independent read-out of the heat and scintillation signals allows to identify and reject alpha particle interactions, the dominant background source for bolometric detectors. In this paper we report the performances of a ZnSe crystal operated within the LUCIFER R&D. We measured the scintillation yield, the energy resolution and the background in the energy region where the signal from neutrinoless double beta decay of 82Se is expected with an exposure of 9.4 kg x days. With a newly developed analysis algorithm we improved the rejection of alpha events, and we estimated the increase in energy resolution obtained by the combination of the heat and light signals. For the first time we measured the light emitted by nuclear recoils, and found it to be compatible with zero. We conclude that the discrimination of nuclear recoils from beta/gamma interactions in the WIMPs energy region is possible, but low-noise light detectors are needed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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