Recent results from the DANSS experiment
Abstract
Recent results from the DANSS experiment on the searches for sterile neutrinos are presented. They are based on approximately 5.5 million inverse beta decay events collected at 10.9, 11.9 and 12.9m from the reactor core of the 3.1 GW Kalinin Nuclear Power Plant in Russia. We do not see any statistically significant sign for the ˉνe oscillations. The exclusion area in the sterile neutrino oscillation parameters Δm241, sin22θee goes up to sin22θee<0.005 in the most sensitive region in the reactor model independent study. A comparison of the absolute neutrino event rate and reactor models predictions allowed to exclude practically the whole sterile neutrino parameter space preferred by the BEST experiment as well as the best fit point of the Neutrino-4 experiment. Studies of the positron energy spectrum in the antineutrino inverse beta decay reaction and its dependence on the fuel composition are also presented. The ratio of the cross sections for 235U and 239Pu was measured. Reactor power was measured remotely using antineutrinos with 1.3% accuracy in 3 days during 6.5 years.
Based on a presentation at the XII International Conference on New Frontiers in Physics (ICNFP 2023).
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