Abstract
The problem of inelastic nucleon-nucleus scattering is formulated in the framework of Green functions. In this microscopic description, the non-instantaneous (energy-dependent) part of the effective particle-hole force (irreducible vertex) determines the non-direct contributions to the scattering matrix. In order to obtain the intermediate structure this vertex is studied in more detail and several approximations are given. Couplings of virtual phonons of different kinds play an important role in this procedure. If one goes beyond perturbation theory three different effective forces occur in the coupling process. The connection to microscopic nuclear structure calculations is discussed. The general form of T matrix emerging from the structure of the effective particle-hole force is given. Additionally more explicit expressions are derived by assuming certain structures of the final nucleus state.
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