부산대학교 도서관

We present new results of the DANSS experiment on the searches for sterile neutrinos. They are based on 2.1 million of inverse beta decay events collected at 10.7, 11.7 and 12.7 meters from the reactor core of the 3.1 GW Kalinin Nuclear Power Plant in Russia. This data sample is 2.5 times larger than the data sample in the previous DANSS publication. The search for the sterile neutrinos is performed using the ratio of $\bar\nu_e$ spectra at two distances. This method is very robust against systematic uncertainties in the $\bar\nu_e$ spectrum and the detector efficiency. We do not see any statistically significant sign for the $\bar\nu_e$ oscillations. This allows us to exclude further a large and interesting part of the sterile neutrino parameter space. All results are preliminary.
Comment: European Physical Society Conference on High Energy Physics, EPS-HEP2019, 10-17 July 2019, Ghent, Belgium