Speaker
Description
We present new results of the DANSS experiment on searches for sterile neutrinos. They are based on more than 3 million of inverse beta decay events collected at 3 distances from the reactor core of the 3.1 GW Kalinin Nuclear Power Plant in Russia. This data sample is more than 3 times larger than the data sample in the previous DANSS publication. In addition to the most robust analysis based on the comparison of the antineutrino energy spectrum shape at different distances, we will present also the analysis which uses information about the counting rates as well. We compare the shape of the antineutrino energy spectrum with theoretical predictions. The antineutrino energy spectrum dependence on fuel composition is also presented. We present the relative IBD rate dependence on the fission fraction of 239Pu for different antineutrino energy ranges as in the Daya Bay analysis with comparable errors and a somewhat larger range of 239Pu fission fraction. We compare obtained results with the theoretical expectations and with the results from Daya Bay and RENO. We have also measured the reactor power using the IBD event rate during more than 3 years with a statistical accuracy of 1.5% in 2 days.
