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arXiv · 1703.10779

First measeurements in search for keV-sterile neutrino in tritium beta-decay by Troitsk nu-mass experiment

J. N. Abdurashitov·A. I. Belesev·V. G. Chernov·E. V. Geraskin·A. A. Golubev·P. V. Grigorieva·G. A. Koroteev·N. A. Likhovid·A. A. Nozik·V. S. Pantuev·V. I. Parfenov·A. K. Skasyrskaya·I. I. Tkachev·S. V. Zadorozhny
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Abstract

We present the first measurements of tritium beta-decay spectrum in the electron energy range 16-18.6 keV. The goal is to find distortions which may correspond to the presence of a heavy sterile neutrinos. A possible contribution of this kind would manifest itself as a kink in the spectrum with a similar shape but with end point shifted by the value of a heavy neutrino mass. We set a new upper limits to the neutrino mixing matrix element U^2_{e4} which improve existing limits by a factor from 2 to 5 in the mass range 0.1-2 keV.

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J. N. Abdurashitov, A. I. Belesev, V. G. Chernov, E. V. Geraskin, A. A. Golubev, P. V. Grigorieva, G. A. Koroteev, N. A. Likhovid, A. A. Nozik, V. S. Pantuev, V. I. Parfenov, A. K. Skasyrskaya, I. I. Tkachev, S. V. Zadorozhny. 2017-03-31. First measeurements in search for keV-sterile neutrino in tritium beta-decay by Troitsk nu-mass experiment. https://doi.org/10.1134/s0021364017120013

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