Publication: Reactor antineutrino physics with DANSS experiment
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2019
Авторы
Alekseev, I.
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© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).DANSS is a solid state scintillation detector of reactor antineutrino, placed just below 3.1 GW industrial light water reactor of Kalininskaya Nuclear Power Plant about 350 km NW from Moscow. A cubic meter sensitive volume of the detector is formed by 2500 scintillator strips with individual SiPM readout. Groups of 50 strips are also readout by conventional PMTs. Reactor antineutrinos are detected by inverse beta-decay (IBD). The sensitive volume has passive shielding of copper (5 cm), borated polyethylene (two layers of 8 cm), lead (5 cm) and active shielding of double layer scintillation counters. The position below reactor provides overburden about 50 m.w.e. A movable platform of the detector allows to change its distance to the reactor from 10.7 to 12.7 m (center to center). 5000 IBD events are detected daily in the position closest to the reactor. Ratio of the antineutrino spectra at different distances measured with the DANSS detector is sensitive to neutrino oscillations to sterile neutrinos in the most interesting region of the oscillation parameters space (delta m squared 1 eV2), where the effect is suspected by Gallium and Reactor antineutrino anomalies. The DANSS collaboration presents results of 1.5 year detector running with three positions (10,7, 11.7 and 12.7 m) cycled weekly. The talk covers sterile neutrino search results as well as analysis details.
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Alekseev, I. Reactor antineutrino physics with DANSS experiment / Alekseev, I. // Proceedings of Science. - 2019. - 340