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| VOLUME 105 (2017) | ISSUE 12 | PAGE 723 |
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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+
+Institute for Nuclear Research RAS, 117312 Moscow, Russia *Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia ×Physics Department, Novosibirsk State University, 630090 Novosibirsk, Russia
Abstract
We present the first results of precision measurements of tritium β-decay spectrum in the electron energy range 16-18.6 keV by the Troitsk nu-mass experiment. The goal is to find distortions which may be caused by the existence of a heavy sterile neutrinos. A signature would correspond to a kink in the spectrum with characteristic shape and end point shifted by the value of a heavy neutrino mass. We set a new upper limits to the neutrino mixing matrix element U2e4 which improve existing limits by a factor from 2 to 5 in the mass range 0.1-2 keV. |