Speaker
Description
New results from the DANSS experiment on the searches for sterile neutrinos are presented. They are based on 7 million inverse beta decay events collected at 10.9, 11.9, and 12.9 meters from the 3.1 GW reactor core of the Kalinin Nuclear Power Plant in Russia. Additional 1 million of antineutrino events further improves the sensitivity for the sterile neutrino mixing parameter below 0.01 for a sterile neutrino mass around 1 eV. Obtained limits exclude practically all sterile neutrino parameters preferred by the recent BEST results for $\Delta m^2$ below 5 $eV^2$. Additional data will allow to test the statistical significance of the DANSS best-fit point in case of the 4-neutrino scenario which was 2.35σ. The neutrino spectrum dependence on the $^{239}Pu$ fission fraction is presented. It agrees with the predictions of the Huber-Mueller model. Using this dependence, the ratio of cross sections for $^{235}U$ and $^{239}Pu$ was extracted. It also agrees with the Huber-Mueller model and somewhat larger than in other experiments. The reactor power was measured using the IBD event rate during 6.5 years with a statistical accuracy of 1.5\% in 2 days and with the relative systematic uncertainty of about 0.5\%. The neutrino oscillation analysis using the predictions for the absolute antineutrino flux from the reactor with a conservative systematic error of 5\% excludes practically all sterile neutrino parameter space preferred by the recent BEST results as well as the best fit point of the Neutrino-4 experiment. Status of the DANSS upgrade will be presented. This upgrade should allow DANSS to test the Neutrino-4 claim of the observation of sterile neutrinos and to scrutinize even larger fraction of the sterile neutrino parameter space preferred by the recent BEST results.
Details
N/A
| Is this abstract from experiment? | Yes |
|---|---|
| Name of experiment and experimental site | DANSS |
| Is the speaker for that presentation defined? | No |
| Internet talk | Maybe |
