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VOLUME 105 | ISSUE 12 | PAGE 723
First measeurements in search for keV-sterile neutrino in tritium beta-decay by Troitsk nu-mass experiment
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.