Understanding NaI(Tl) crystal background for dark matter searches
Understanding NaI(Tl) crystal background for dark matter searches
复制标题
了解 NaI(Tl) 晶体背景以进行暗物质搜索
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
K. S. Park
中科院分区：
文献类型：
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作者：
G. Adhikari;P. Adhikari;C. Ha;E. Jeon;N. Y. Kim;Y. Kim;S. Kong;Hyun Su Lee;S. Oh;J. Park;K. S. Park
我们已经开发了超低本底NaI(Tl)晶体来复制DAMA结果，最终目标是达到与DAMA/Libra晶体相当或更好的纯度水平。即使达到的背景水平不接近DAMA/天秤座，但对背景有一个定量的了解是至关重要的。我们研究了背景模拟，以更深入地了解背景，并为测试装置中使用的9.16公斤NaI(Tl)晶体开发了背景模型。在本文中，我们通过对测量数据进行Geant4蒙特卡罗模拟来定量描述背景源的贡献，以量化背景成分中的未知部分。在拟合结果中，总的模拟本底能谱很好地描述了9.16 kg的NaI(Tl)晶体的测量数据，并表明在2-6keV能量区间内背景源以表面210Pb210K和内部40K为主，分别产生2.4次/天/keV/kg(Dru)和0.5次/kev/kg(Dru)的本底。
We have developed ultra-low-background NaI(Tl) crystals to reproduce the DAMA results with the ultimate goal of achieving purity levels that are comparable to or better than those of the DAMA/LIBRA crystals. Even though the achieved background level does not approach that of DAMA/LIBRA, it is crucial to have a quantitative understanding of the backgrounds. We have studied background simulations toward a deeper understanding of the backgrounds and developed background models for a 9.16-kg NaI(Tl) crystal used in the test arrangement. In this paper we describe the contributions of background sources quantitatively by performing Geant4 Monte Carlo simulations that are fitted to the measured data to quantify the unknown fractions of the background compositions. In the fitted results, the overall simulated background spectrum well describes the measured data with a 9.16-kg NaI(Tl) crystal and shows that the background sources are dominated by surface $$^{210}$$210Pb and internal $$^{40}$$40K in the 2–6-keV energy interval, which produce 2.4 counts/day/keV/kg (dru) and 0.5 dru, respectively.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.
XENON100 数据 225 天的暗物质结果
影响因子：
8.6
作者：
Aprile, E.;Alfonsi, M.;Weinheimer, C.
通讯作者：
Weinheimer, C.