Observation of Atmospheric Temperature and Pressure Effects in the Cosmic Muon Flux with the DANSS Detector

The DANSS detector is located at the Kalinin Nuclear Power Plant under a commercial reactor core, which provides an overburden of about 50 m. w. e. in the vertical direction. This means that DANSS detector occupies an intermediate position between surface and underground detectors in terms of cosmic rays. The detector can reconstruct the tracks of muons passing through its sensitive volume due to its fine spatial segmentation. The detector is placed on a lifting platform, and data are collected in three positions (10.9, 11.9, and 12.9 meters from the reactor core center). The overburden parameter 〈Ethrcos θ〉 (the averaged product of the threshold energy of muons and the zenith angle cosine) characterizing the amount of matter above the detector is measured for the upper, middle, and lower positions of the detector. Muon data are collected for more than two years. The preliminary values of the temperature and barometric correlation coefficients (α and β) are calculated for each position of the detector.