DMTPC：一种新的暗物质定向探测装置

DMTPC探测器

The DMTPC detector

对暗物质的定向探测可以明确地直接探测到WIMP，也可以区分银河系中的各种暗物质模型。DMTPC探测器是一种低压TPC，具有光学读数，设计用于定向直接探测WIMP。通过使用CF4气体作为活性材料，该探测器还对质子与暗物质的自旋相关相互作用具有优异的灵敏度。

Directional detection of Dark Matter

Among the many experimental techniques available, those providing directional information have the potential of yielding an unambiguous observation of WIMPs even in the presence of insidious backgrounds. A measurement of the distribution of arrival direction of WIMPs can also discriminate between Galactic Dark Matter halo models. In this article, I will discuss the motivation for directional detectors and review the experimental techniques used by the various experiments. I will then describe one of them, the DMTPC detector, in more detail.

低能中子核反冲中“头尾”效应的观测

Observation of the 'head-tail' effect in nuclear recoils of low-energy neutrons

对暗物质的定向探测可以提供对暗物质相互作用的明确观测，即使在存在背景的情况下。本文介绍了一种利用探测器材料探测暗物质粒子散射过程中弹性核反冲产生的闪烁光来测量暗物质风方向标记（“首尾”）的实验方法。该技术是通过标记的低能中子与CF 4在低压时间投影室，是由DMTPC合作开发的散射中产生的核反冲的方向证明。测量沿反冲轨道电离率的下降提供了入射中子的方向标记，并证明了“头-尾”效应的观察。