학술논문
Measurements with a TRISTAN prototype detector system at the 'Troitsk nu-mass' experiment in integral and differential mode
Document Type
Working Paper
Author
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; Siegmann, Daniel; Skasyrskaya, Aino; Slezák, Martin; Tkachev, Igor; Zadorozhny, Sergey
Source
Subject
Language
Abstract
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.
Comment: 17 pages, 10 figures, Tristan in Troitsk phase 2 and 3
Comment: 17 pages, 10 figures, Tristan in Troitsk phase 2 and 3