Measurement of the directional sensitivity of Dark Matter Time Projection Chamber detectors
Measurement of the directional sensitivity of Dark Matter Time Projection Chamber detectors
复制标题
暗物质时间投影室探测器的方向灵敏度测量
DOI：
10.1103/physrevd.95.122002
复制
发表时间：
2017
影响因子：
5
通讯作者：
Deaconu C
中科院分区：
文献类型：
--
作者：
Deaconu C
暗物质时间投影室（DMTPC）是一种方向敏感探测器，它利用光学和电荷读出系统测量低压气体中反冲和原子核的方向。在本文中，我们采用测量从两个DMTPC探测器，与30-60欧姆的工作压力，开发和验证的模型的方向响应和性能的这种探测器作为反冲能量的函数。使用我们的模型作为基准，我们制定了必要的规格可扩展的定向探测器的灵敏度与当前一代计数（非定向）实验，只测量反冲能量。假设现有DMTPC探测器的性能，以及当前对自旋相关WIMP-核截面的限制，我们发现，一个10-20公斤尺度的方向敏感探测器能够将核反冲的测量方向与入射暗物质粒子的预测方向相关联，并提供决定性的（）证实了来自非定向实验的候选信号确实是由暗物质粒子从目标核的弹性散射引起的。
The dark matter time projection chamber (DMTPC) is a direction-sensitive detector designed to measure the direction of recoilingandnuclei in low-pressuregas using optical and charge readout systems. In this paper, we employ measurements from two DMTPC detectors, with operating pressures of 30–60 torr, to develop and validate a model of the directional response and performance of such detectors as a function of recoil energy. Using our model as a benchmark, we formulate the necessary specifications for a scalable directional detector with sensitivity comparable to that of current-generation counting (nondirectional) experiments, which measure only recoil energy. Assuming the performance of existing DMTPC detectors, as well as current limits on the spin-dependent WIMP-nucleus cross section, we find that a 10–20 kg scale direction-sensitive detector is capable of correlating the measured direction of nuclear recoils with the predicted direction of incident dark matter particles and providing decisive () confirmation that a candidate signal from a nondirectional experiment was indeed induced by elastic scattering of dark matter particles off of target nuclei.