暗物质中子的特性
Features of Fast Neutrons in Dark Matter Searches
摘要：
“快”或“高能量”中子的衍射散射可以在信号区域产生低能核反冲，用于暗物质搜索。我们提出了一个使用“黑盘”模型的讨论。这允许对这种可能的背景进行简单和一般的、尽管是近似的描述。我们注意到它的一些特点。特别是有质量数A的依赖方面，可以在不同的原子核上的事件在同一时间可观察的设置中进行研究。这些包括反冲能量分布和截面的A行为。我们定义了一个参数$E^o_R$，它表征了由于快中子而预期的反冲能。它的范围从100千电子伏轻核的几个千电子伏重核，和一般的治疗是可能的，在它的“黑盘”近似。此外，非弹性过程的存在也是快中子的特征。
英文摘要：
Diffractive scattering of "fast" or "high energy" neutrons, can give low energy nuclear recoils in the signal region for dark matter searches. We present a discussion using the 'black disc' model. This permits a simple and general, although approximate, description of this possible background. We note a number of its features. In particular there are mass number A dependent aspects which can be studied in setups where events on different nuclei are observable at the same time. These include the recoil energy distributions, and the A behavior of the cross section. We define a parameter $E^o_R$ which characterizes the recoil energy to be expected due to fast neutrons. It ranges from 100 keV on light nuclei to a few keV on heavy nuclei, and a general treatment is possible in terms of it, within the 'black disc' approximation. In addition, the presence of inelastic processes would be characteristic of fast neutrons.
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