The standard one-particle Green function (GF) is extended to account for scattering from open-shell many-body targets. This extended GF possesses a self-energy which is an exact optical potential (OP) for scattering from open-shell targets. Furthermore, to each scattering process with well-defined quantum numbers there is a specific OP, thus reducing the multichannel problem to single-channel ones. As an explicit example we work out, in detail, the scattering of spin-1/2 projectiles from open-shell targets.
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Mathematical Physics
- Physics and Astronomy (all)