Investigation of Ultrahigh-Energy Cosmic-Ray Anisotropy Using the Data on Muon Bundles Recorded with the DECOR Coordinate-Tracking Detector

Abstract

Results of investigation of the high-energy cosmic-ray flux anisotropy using data on muon bundles are presented. The events were recorded in the period of 2013–2017 with the DECOR coordinate-tracking detector, which is a part of the unique scientific setup of the Experimental complex NEVOD. Methods for experimental data processing and taking atmospheric effects into account are described. Results of the analysis of two types of muon bundle events, which correspond to different ranges of primary particle energies (E > 10¹⁵ eV and E > 10¹⁶ eV) are discussed. Upper limits of the anisotropy amplitude for the two types of events are obtained.