1 Non - polarizing two – atom interaction potential in the liquid 4 He

It is known, that the Leonard–Jones (L–J) potential describes the interaction of atoms of simple non-polar gases [1]. However, at large distances between atoms the interaction forces fall faster, than it is described by the L–J potential [1]. The corresponding corrections (including light atoms) are suggested in papers [2]–[6]. These authors had a suspicion, that, for light atoms, either L–J formula or pair interaction approximation, or both of them are not valid. In this paper, we show that the rapid decrease of the potential can be explained, if we assume that the atom polarization is not important in the liquid. In this paper, we calculate the potential U between charge densities of electrons and nuclei for He in the ground state. The interaction energy of two charge distributions with the densities ρ1(r) and ρ2(r) is