Speaker
Description
The primary goal of the DANSS (Detector of AntiNeutrino based on Solid Scintillator) experiment is to search for neutrino oscillations into a hypothetical sterile state. Currently, the experiment provides the world's best model-independent limits for searching for sterile neutrinos in the range of $Δ𝑚^2_{14}$ ∼ 1 eV$^2$, $sin^2 2𝜃_{𝑒𝑒} < 0.01$. Achieving goals of the experiment requires high-precision energy calibration of the detector.
The talk investigates the nonlinearities of the DANSS photodetectors. The primary objective is to obtain values for the counters nonlinearity parameters, correction for which may subsequently improve the accuracy of the detector energy scale calibration. The study was conducted using data on muon events passing through the detector, accumulated over several years of experiment operation, as well as data from detailed Monte Carlo simulations of the detector. During analysis the trajectories of passing muons were reconstructed, allowing us to establish their energy release in the detector's sensitive volume. This work also examines the influence of possible detector geometric imperfections on the accuracy of muon trajectory reconstruction, proposes and implements methods for minimizing these effects.
