Abstract
DANSS is a one cubic meter highly segmented solid scintillator detector. DANSS is placed on a lifting platform under a 3.1 GW \({}_{\textrm{th}}\) power reactor of the Kalinin Nuclear Power Plant. The distance from the reactor core center to the detector is varied from 10.9 to 12.9 m. The inverse beta decay (IBD) reaction is used for antineutrinos detection. DANSS sees about 5000 IBD events per day with a few percent of cosmic muons background. In this paper the result of the reactor power reconstruction for nearly 8 years based on the IBD rates with 1 \(\%\) accuracy is presented. Also the fission fractions of \({}^{235}\) U and \({}^{239}\) Pu are calculated with 2.4 \(\%\) accuracy for 10-day time periods using the IBD spectra with excluded bump region. More than that, a new method is proposed to calculate the IBD yield ratio \(\dfrac{\sigma_{5}}{\sigma_{9}}\) with an error significantly smaller than in previous experimental works. Besides several methods of the remote observation of the amount of \({}^{239}\) Pu that produced by a reactor were tested.
