一种用于暗物质实验的高效中子否决器
A Highly Efficient Neutron Veto for Dark Matter Experiments
摘要：
我们提出了一个概念设计的主动中子否决，基于硼负载液体闪烁体，用于直接检测暗物质实验。1米厚的否决权的模拟效率，包括中子捕获的影响，在内部检测器和效率低下，由于进料到否决权，是大于99.5%的放射性中子产生的背景事件，而由于外部产生的宇宙成因中子的背景减少了95%以上。否决权既能显著抑制这两种主要背景源，又能提供现场测量，这将使下一代暗物质实验更加稳健，并大大提高基于对少数反冲事件的观测而声称的暗物质探测的可信度。否决权还将允许在小型探测器的无背景操作与类似构造的较大探测器的物理范围之间进行直接推断。
英文摘要：
We present a conceptual design for an active neutron veto, based on boron-loaded liquid scintillator, for use in direct-detection dark matter experiments. The simulated efficiency of a 1 meter thick veto, after including the effects of neutron captures in the inner detector and inefficiencies due to feed-throughs into the veto, is greater than 99.5% for background events produced by radiogenic neutrons, while the background due to externally produced cosmogenic neutrons is reduced by more than 95%. The ability of the veto to both significantly suppress, and provide in situ measurements of, these two dominant sources of background would make the next generation of dark matter experiments much more robust, and dramatically improve the credibility of a dark matter detection claim based on the observation of a few recoil events. The veto would also allow direct extrapolation between the background-free operation of a small detector and the physics reach of a larger detector of similar construction.
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