http://arxiv.org/abs/1606.04734
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.
Y. Li
Thu, 16 Jun 16
29/67
Comments: 5 pages, 3 figures, proceedings for the TAUP 2015 conference, published in J. Phys. Conf. Ser. 718 (2016) 062038
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