Abstract
Starting from the supposition that an exotic system constituted of a hadron, a nucleus, and an electron, which interact with each other by Coulomb pair forces, forms a quantum-mechanical system, the interaction potential between the hadron and the nucleus in the exotic system is analytically derived. It is shown that the structure of the additional potential depends on the three-body system charge structure, as well as on the isotopic one. It is precisely this asymmetry both in the electric charges and in the masses of the constituent particles that is responsible for the long lifetime of the exotic systems.