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arXiv 1805.03381physics.ins-dethep-ex
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用于COSINE-100实验的快中子探测器研究

Study of fast neutron detector for COSINE-100 experiment

G. Adhikari, P. Adhikari, C. Ha, E. J. Jeon, K. W. Kim, N. Y. Kim, Y. D. Kim, Y. J. Ko, H. S. Lee, J. Lee, M. H. Lee, R. H. Maruyama, S. L. Olsen, H. Prihtiadi

摘要:

COSINE实验是一个用NaI晶体进行的暗物质实验,计划在该实验中建立一个快中子监测系统。我们进行了几个R&D方法的中子探测器使用液体闪烁体(LS)。采用脉冲形状鉴别(PSD)技术鉴别中子事例,比较了两种不同LS的PSD特性。对于能量在200 keVee至1500 keVee之间的中子和$γ$之间已经实现了良好的分离能力。氧化铝吸附、过滤和水萃取的组合在纯化LS中是有效的,这导致由$^{210}$ Po引起的$α$污染减少超过两倍。测得纯化前后$α$的活性分别为0.36 $\pm$ 0.04~mBq/kg和0.21 $\pm$ 0.03~mBq/kg。

英文摘要:

A monitoring system for fast neutrons is planned in the COSINE experiment, a dark matter experiment with NaI crystals. We pursued several R&D approaches for a neutron detector using a liquid scintillator (LS). A pulse shape discrimination (PSD) technique is used for the identification of neutron events and the PSD properties of two different LS were compared. A good separation power between neutrons and $γ$ has been achieved for energies between 200 keVee to 1500 keVee. The combination of alumina adsorption, filtration, and water extraction is effective in purifying the LS, which leads to a reduction in the $α$ contamination by $^{210}$Po of more than a factor of two. The measured activities of the internal $α$ are 0.36$\pm$0.04~mBq/kg and 0.21$\pm$0.03~mBq/kg before and after purification, respectively.

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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