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Measurements with a TRISTAN prototype detector system at the "Troitsk nu-mass" experiment in integral and differential mode

  • Brunst, Tim
  • Houdy, Thibaut
  • Mertens, Susanne
  • Nozik, Aleksander
  • Pantuev, Vladislav
  • Abdurashitov, Djohnrid
  • Altenmüller, Konrad
  • Belesev, Alexander
  • Bombelli, Luca
  • Chernov, Vasiliy
  • Geraskin, Evgeniy
  • Huber, Anton
  • Ionov, Nikolay
  • Koroteev, Gregory
  • Korzeczek, Marc
  • Lasserre, Thierry
  • Lechner, Peter
  • Likhovid, Nikolay
  • Lokhov, Alexey
  • Parfenov, Vladimir
  • And 5 more
Publication Date
Oct 18, 2019
Submission Date
Sep 06, 2019
DOI: 10.1088/1748-0221/14/11/P11013
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Sterile neutrinos emerge in minimal extensions of the Standard Model which can solve a number of open questions in astroparticle physics. For example, sterile neutrinos in the keV-mass range are viable dark matter candidates. Their existence would lead to a kink-like distortion in the tritium $\beta$-decay spectrum. In this work we report about the instrumentation of the Troitsk nu-mass experiment with a 7-pixel TRISTAN prototype detector and measurements in both differential and integral mode. The combination of the two modes is a key requirement for a precise sterile neutrino search, as both methods are prone to largely different systematic uncertainties. Thanks to the excellent performance of the TRISTAN detector at high rates, a sterile neutrino search up to masses of about 6 keV could be performed, which enlarges the previous accessible mass range by a factor of 3. Upper limits on the neutrino mixing amplitude in the mass range < 5.6 keV (differential) and < 6.6 keV (integral) are presented. These results demonstrate the feasibility of a sterile neutrino search as planned in the upgrade of the KATRIN experiment with the final TRISTAN detector and read-out system.

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