Observation of the 'head-tail' effect in nuclear recoils of low-energy neutrons
Observation of the 'head-tail' effect in nuclear recoils of low-energy neutrons
复制标题
低能中子核反冲“头尾”效应的观察
DOI：
10.1016/j.nima.2007.10.037
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发表时间：
2007
影响因子：
1.4
通讯作者：
R. Yamamoto
中科院分区：
文献类型：
--
作者：
D. Dujmic;H. Tomita;M. Lewandowska;S. Ahlen;Peter H. Fisher;Shawn Wesley Henderson;A. Kaboth;G. Kohse;Richard C. Lanza;J. Monroe;A. Roccaro;Gabriella Sciolla;N. Skvorodnev;R. Vanderspek;H. Wellenstein;R. Yamamoto
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察，即使在存在背景的情况下也是如此。本文提出了一种通过探测暗物质粒子与探测器材料散射中的弹性核反冲产生的闪烁光来测量暗物质风的方向标记(“头尾”)的实验方法。这项技术是通过在DMTPC合作开发的低压时间投影室中标记低能中子与CF4散射产生的核反冲的方向来演示的。对沿反冲轨迹递减电离率的测量提供了入射中子的方向标记，并证明了可以观察到“头-尾”效应。
Directional detection of dark matter can provide unambiguous observation of dark matter interactions even in the presence of background. This article presents an experimental method to measure the direction tag (“head-tail”) of the dark matter wind by detecting the scintillation light created by the elastic nuclear recoils in the scattering of dark matter particles with the detector material. The technique is demonstrated by tagging the direction of the nuclear recoils created in the scattering of low-energy neutrons with CF4in a low-pressure time-projection chamber that is developed by the DMTPC collaboration. The measurement of the decreasing ionization rate along the recoil trajectory provides the direction tag of the incoming neutrons, and proves that the “head-tail” effect can be observed.