Increasing light collection efficiency of liquid argon detector for low mass WIMP search
Increasing light collection efficiency of liquid argon detector for low mass WIMP search
复制标题
提高液氩探测器的光收集效率，用于低质量 WIMP 搜索
DOI：
10.1088/1742-6596/1468/1/012034
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Aoyama Kazutaka
中科院分区：
文献类型：
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作者：
Huang;J.;B. Tan;S. Masuda;X. Cheng;S. K. Bisoi;and V. Melnikov,;Aoyama Kazutaka
液态氩（LAr）被认为是弱相互作用大质量粒子（WIMP）暗物质直接探测搜索实验的优良靶材料。在WIMP搜索中，区分信号事件和电子反冲（ER）背景是必不可少的。随着光收集效率的增加，使用脉冲形状鉴别（PSD）的ER功率的降低得到改善。然而，必须在低温环境中操作的光传感器在氩的128nm VUV闪烁光下没有高量子效率（QE）。因此，波长移位器，即四苯基丁二烯（TPB），蒸发在检测器的内表面上，以将VUV转换为可由光电传感器检测的可见光。
Liquid argon (LAr) is known as an excellent target material for weakly interacting massive particle (WIMP) dark matter direct-detection search experiment. In WIMP searches, distinguishing signal events from electronic recoil (ER) backgrounds is essential. The reduction of ER power using pulse shape discrimination (PSD) improves as light collection efficiency increases. However photosensors, which have to be operational in a cryogenic environment, have no high quantum efficiency (QE) at the 128 nm VUV scintillation light of argon. Therefore, a wavelength shifter, ie tetraphenyl butadiene (TPB), is evaporated on the inner surface of the detector to convert VUV to visible light that can be detected by photosensors.