A system of local criteria for separating EAS by primary particle masses based on the lengths of the major axis of images in the Cherenkov light angular distribution detector of the SPHERE-3 facility

The planned SPHERE-3 installation, unlike the SPHERE-2 installation, will have not only a telescope of reflected Cherenkov light, but also a detector that records the angular distribution of direct Cherenkov light. In this paper, the length of the major axis of the Cherenkov image is considered as a parameter sensitive to the mass of the primary particle. A method for estimating the mass of a primary particle based on the length of the major axis of the Cherenkov image has been improved, and a method for classifying primary particles based on data from direct and reflected light detectors has been created.