Speaker
Description
Solid state spectrometer of reactor antineutrino DANSS is placed
below the core of the 3.1 GWt_th industrial nuclear reactor of
Kalininskaya NPP. In the closest position to the reactor
the detector counts more than 5000 inverse beta-decay (IBD) events
per day with background below 2 %. The distance to the reactor is
changed weekly between 10.9 and 12.9 m, which allows to make a
model-free search for a short range neutrino oscillations. Spectrum
evolution with the distance is measured directly by the same detector.
The talk is based on the statistics of 6 million events,
obtained during 6 years between April 2016 and March 2022.
We present limits in the short range oscillation
parameter space. We also compared the anti-neutrino
energy spectrum with theoretical predictions and
confirm a bump in their ratio similar to the bumps
observed in several other experiments.
