论文标题
使用$^{3} $ He Neutron Captur
Mitigation of Backgrounds from Cosmogenic $^{137}$Xe in Xenon Gas Experiments using $^{3}$He Neutron Capture
论文作者
论文摘要
\ Xe {136}用作许多搜索\ bbnonu的实验的目标介质。尽管地下运行，但到达实验室的宇宙兆兆可以产生散布中子，从而导致探测器材料的激活。难以使用MUON标记的潜在背景以\ Xe {137}的形式由\ Xe {136}上的中子捕获而创建。这种同位素通过β衰减衰减，半衰期为3.8分钟，$ \ sim $ 4.16 meV腐烂。这项工作提出并探讨了将一小部分\ He {3}添加到Xenon中的概念，以此作为捕获热中子并减少检测器体积中激活的数量的一种手段。当使用这种技术时，我们发现\ Xe {137}激活的污染物可以降低至吨和多吨尺度的高压气体XENON中微子中微子双β衰减实验的水平可忽略不计。
\Xe{136} is used as the target medium for many experiments searching for \bbnonu. Despite underground operation, cosmic muons that reach the laboratory can produce spallation neutrons causing activation of detector materials. A potential background that is difficult to veto using muon tagging comes in the form of \Xe{137} created by the capture of neutrons on \Xe{136}. This isotope decays via beta decay with a half-life of 3.8 minutes and a \Qb\ of $\sim$4.16 MeV. This work proposes and explores the concept of adding a small percentage of \He{3} to xenon as a means to capture thermal neutrons and reduce the number of activations in the detector volume. When using this technique we find the contamination from \Xe{137} activation can be reduced to negligible levels in tonne and multi-tonne scale high pressure gas xenon neutrinoless double beta decay experiments running at any depth in an underground laboratory.
