Observation and applications of single-electron charge signals in the XENON100 experiment

Observation and applications of single-electron charge signals in the XENON100 experiment
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XENON100实验中单电子电荷信号的观测及应用

DOI:
10.1088/0954-3899/41/3/035201
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发表时间:
2013-11
期刊:
Journal of Physics G: Nuclear and Particle Physics
影响因子:
--
通讯作者:
Weinheimer, C.
Weinheimer, C.
中科院分区:
其他
文献类型:
--
作者:
Vitells, O.;Wang, H.;Weber, M.;Weinheimer, C.

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XENON100暗物质实验使用时间投影室(TPC)中的液体氙气来测量由暗物质弱相互作用大质量粒子(WIMP)散射产生的氙核反冲。本文报道了与WIMP相互作用无关的单电子电荷信号的观测结果。这些信号显示了探测器对小电荷信号的良好灵敏度,解释说是由于液体氙气中的杂质和TPC内部金属成分的光致电离。它们被用作唯一的校准源来表征探测器。我们解释了如何推断XENON100实验的关键参数:二次闪烁增益、从液体到气相的萃取率和电子漂移速度。
The XENON100 dark matter experiment uses liquid xenon in a time projection chamber (TPC) to measure xenon nuclear recoils resulting from the scattering of dark matter weakly interacting massive particles (WIMPs). In this paper, we report the observation of single-electron charge signals which are not related to WIMP interactions. These signals, which show the excellent sensitivity of the detector to small charge signals, are explained as being due to the photoionization of impurities in the liquid xenon and of the metal components inside the TPC. They are used as a unique calibration source to characterize the detector. We explain how we can infer crucial parameters for the XENON100 experiment: the secondary-scintillation gain, the extraction yield from the liquid to the gas phase and the electron drift velocity.
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