Speaker
Description
The DANSS is a highly segmented m3 antineutrino-spectrometer aimed to search for SBL sterile neutrino oscillations in reactor sector, as well as to solve applied tasks of monitoring the power and fuel composition of a nuclear reactor. The detector measures the antineutrino spectrum by the IBD method from an industrial nuclear reactor (3.1 GWth, KNNP, Rusia) at distances 10.7-12.7 m from the core using a mobile platform. The search for oscillations in sterile neutrino is carried out through the analysis of the bin-per-bin ratios of the positron energy spectra collected at different distances from the reactor. This relative method is free from systematic errors associated with the calculation of the reactor antineutrino spectra and detector efficiency.
The new results of the DANSS experiment are presented here based on more than 2.1 million events collected in 2016-2019 (2.4-fold increase over published data. With the current full data set we do not have a statistically significant sign of the sterile neutrino oscillations excluding further the large and interesting portion of the 3v+ 1v model phase space. The DANSS’s abilities to measure nuclear fuel composition and to monitor reactor power at high will be also discussed.
