Abstract
A general expression is obtained in the coordinate representation for the folding potential describing the interaction of an incoming structureless particle with the centre of mass of a composite nucleus in the case of nonlocal pair interactions. This expression is derived using the Fourier transform of the folding potential in the momentum representation, written as a sum of triangle Feynman diagrams. Two vertices of such a diagram describe the virtual decay of the nucleus into nucleons and the inverse synthesis process. The third vertex is the Fourier component of the pair potential of interaction of the incoming particle with a nucleon belonging to this nucleus. A similar approach was used to obtain the expression for the double-folding potential describing the interaction of two composite objects (nuclei).
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