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arXiv 1606.04734astro-ph.COhep-ph
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残余活跃和惰性中微子的直接探测

Direct detection of relic active and sterile neutrinos

Yu-Feng Li

摘要:

在早期宇宙中,活跃和惰性的亚电子伏特中微子都可以形成宇宙中微子背景。我们认为β衰变(例如,$^3$ H)和EC衰减(例如,$^{163}$ Ho)核作为实验室捕获残余中微子的理想靶。计算了(3 + $N_{\rm s}$)味混合方案中残余电子中微子和反中微子相对于相应的β衰变或电子俘获(EC)衰变背景的俘获率,并结合PIMMY计划讨论了未来的发展前景.我们强调,从长远来看,这种直接测量热DM的方法可能并非毫无希望。

英文摘要:

Both active and sterile sub-eV neutrinos can form the cosmic neutrino background in the early Universe. We consider the beta-decaying (e.g., $^3$H) and EC-decaying (e.g., $^{163}$Ho) nuclei as the promising targets to capture relic neutrinos in the laboratory. We calculate the capture rates of relic electron neutrinos and antineutrinos against the corresponding beta decay or electron capture (EC) decay backgrounds in the (3+$N_{\rm s}$) flavor mixing scheme, and discuss the future prospect in terms of the PTOLEMY project. We stress that such direct measurements of hot DM might not be hopeless in the long term.

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