Preliminary Estimation of the Atmospheric Neutrinos Detection Efficiency in NOvA

The NOvA experiment, aimed at studying the neutrino oscillations in the muon neutrino and antineutrinos beam, uses two segmented liquid scintillator detectors, with masses of 300 tons and 14 kilotons, respectively. The large size and high segmentation of the NOvA detectors, as well as a flexible system of software triggers and data acquisition, make it possible to solve additional physical problems, in particular, to detect and study the atmospheric neutrino flux. This paper presents simulating events from interactions of the atmospheric neutrinos in the far detector of the NOvA experiment, as well as a preliminary evaluation of the efficiency of signal event selection.