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

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.

arXiv comment5 pages, 4 figures, accepted for publication version

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• Beta and Neutrinoless Double Beta Decays with KeV Sterile Fermions
• Characterization of Silicon Drift Detectors with Electrons for the TRISTAN Project
• Measurements with a TRISTAN prototype detector system at the "Troitsk nu-mass" experiment in integral and differential mode
• Circular polarization of cosmic photons due to their interactions with Sterile neutrino dark matter
• Development of a Silicon Drift Detector Array to Search for keV-scale Sterile Neutrinos with the KATRIN Experiment
• A lab scale experiment for keV sterile neutrino search
• Probing sterile neutrino dark matter in the PTOLEMY-like experiment
• Investigation of Electron Backscattering on Silicon Drift Detectors for the Sterile Neutrino Search with TRISTAN
• Investigations of Charge Collection and Signal Timing in a multi-pixel Silicon Drift Detector