Speakers
Description
The highly segmented DANSS anti-neutrino scintillation detector is located at the Kalinin NPP and collects up to 5000 antineutrino events per day. The reactor power was measured using the inverse beta-decay (IBD) event rate during 7.5 years with an accuracy of 1.3% in 3 days and with the relative systematic uncertainty of less than 0.8%. The report will present the measured dependence of the antineutrino spectrum on the composition of reactor fuel. The measured ratio of cross-sections 235U/239Pu will be presented. The 239Pu fission fraction was measured during 7 years of the reactor operation using a fit of the measured IBD positron spectrum with model predictions for different isotopes. Taking into account the absolute antineutrino counting rates, the parameters of a hypothetical sterile neutrino region was extended above $\Delta m^2$ > 5 eV$^2$, where there are indications of the existence of a sterile neutrino in the BEST and Neutrino-4 experiments
