Performance of a prototype active veto system using liquid scintillator for a dark matter search experiment
Performance of a prototype active veto system using liquid scintillator for a dark matter search experiment
复制标题
使用液体闪烁体进行暗物质搜索实验的原型主动否决系统的性能
DOI：
10.1016/j.nima.2017.01.041
复制
发表时间：
2017
影响因子：
1.4
通讯作者：
E. Jeon
中科院分区：
文献类型：
--
作者：
J. Park;P. Adhikari;G. Adhikari;S. Oh;N. Y. Kim;Y. Kim;C. Ha;K. Park;H. Lee;E. Jeon
我们报告的性能，主动否决系统使用液体闪烁体与碘化钠（铊）晶体用于暗物质搜索实验。当NaI（Tl）晶体浸没在原型探测器中时，探测器在0-10 keV能区标记了48%的内部40 K本底。我们还确定了6-20 keV事件的标记效率为总事件的26.5±1.7%，相当于0.76±0.04事件/keV/kg/天。根据模拟，来自光电倍增管中的U、Th和K放射性同位素的大约60%的背景事件在0-10 keV的能量下被标记。用40厘米厚的液体闪烁体进行全屏蔽，可以将内部40 K和外部背景的标记效率提高到大约80%。
We report the performance of an active veto system using a liquid scintillator with NaI(Tl) crystals for use in a dark matter search experiment. When a NaI(Tl) crystal is immersed in the prototype detector, the detector tags 48% of the internal40K background in the 0–10 keV energy region. We also determined the tagging efficiency for events at 6–20 keV as 26.5±1.7% of the total events, which corresponds to 0.76±0.04 events/keV/kg/day. According to a simulation, approximately 60% of the background events from U, Th, and K radioisotopes in photomultiplier tubes are tagged at energies of 0–10 keV. Full shielding with a 40-cm-thick liquid scintillator can increase the tagging efficiency for both the internal40K and external background to approximately 80%.