Аннотация:Cosmic rays, entering the Earth's atmosphere, interact with air atoms. As a result of such interaction, the nucleus of an atom breaks up, secondary particles are formed, which spread deep into the atmosphere. This flow of particles is called secondary cosmic rays (SeCR), their composition is diverse. Some particles are stable, while others decay. In the process of SeCR propagation deep into the atmosphere, the processes of decay and interaction of particles with the nuclei of air atoms constantly occur. The main condition for interaction with the nuclei of air atoms is sufficient energy of the particles.