半导体探测器中低质量WIMP灵敏度和通过改变Luke-Neganov声子增益对电子和核粒子的统计鉴别
Low-Mass WIMP Sensitivity and Statistical Discrimination of Electron and Nuclear Recoils by Varying Luke-Neganov Phonon Gain in Semiconductor Detectors
摘要：
在半导体暗物质探测器中放大声子信号可以通过在高电压偏置下操作并将静电势能转换成Luke-Neganov声子来实现。这种放大方法已经在高达|E| = 40 V/cm的电压下得到验证，在CDMS II Ge探测器中不会产生泄漏，允许对质量= 8 GeV和截面为1.8 e-42 cm ^2的基准WIMP的灵敏度，假设在阈值附近的电子反冲背景是平坦的。此外，我们第一次表明，核和电子反冲的Luke-Neganov增益的差异可以用来区分低能量背景和假设的WIMP信号之间的统计操作在两个不同的电压偏置。具体来说，对于一个模拟的20千克-天的实验，99%的事件的p值<1 e-8，其中基准WIMP信号的质量= 8 GeV，截面= 3.3 e-41 cm ^2。
英文摘要：
Amplifying the phonon signal in a semiconductor dark matter detector can be accomplished by operating at high voltage bias and converting the electrostatic potential energy into Luke-Neganov phonons. This amplification method has been validated at up to |E|=40V/cm without producing leakage in CDMSII Ge detectors, allowing sensitivity to a benchmark WIMP with mass = 8GeV and cross section 1.8e-42cm^2 assuming flat electronic recoil backgrounds near threshold. Furthermore, for the first time we show that differences in Luke-Neganov gain for nuclear and electronic recoils can be used to discriminate statistically between low-energy background and a hypothetical WIMP signal by operating at two distinct voltage biases. Specifically, 99% of events have p-value<1e-8 for a simulated 20kg-day experiment with a benchmark WIMP signal with mass =8GeV and cross section =3.3e-41cm^2.
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