Optical potentials for composite particles with allowance for nonlocality effects

Tn the generalized theory of a Fermi liquid, the real part of the optical potential that describes the interaction of a composite particle x with nucleus f is expressed in terms of the single-particle density matrix of particle x and the nonretarded parts of the mass operators of x-particle nucleons in the field of nucleus f. Because the nucleon mass operator involves nonlocal terms, which result in its momentum dependence, the real part of the optical potential for particle x depends on energy and contains gradient terms and terms that are associated with renormalization of the kinetic energy of particle x in the field of nucleus f. The resulting optical potentials represent a generalization of widely used folding potentials, are deep, and satisfy the generalized Levinson theorem.