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

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 β-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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Submitted on : Tuesday, October 15, 2019 - 11:15:14 PM
Last modification on : Wednesday, January 22, 2020 - 2:56:21 PM

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Tim Brunst, Thibaut Houdy, Susanne Mertens, Aleksander Nozik, Vladislav Pantuev, et al.. Measurements with a TRISTAN prototype detector system at the "Troitsk nu-mass" experiment in integral and differential mode. JINST, 2019, 14 (11), pp.P11013. ⟨10.1088/1748-0221/14/11/P11013⟩. ⟨hal-02317271⟩

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