Pion production, pion absorption, and nucleon properties in dense nuclear matter: Relativistic Dirac-Brueckner approach at intermediate and high energies

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Within the relativistic Dirac-Brueckner approach we discuss the properties of highly-energetic nucleons and deltas in dense nuclear matter. The effective NN and N{Δ} interactions are constructed in a fully self-consistent way and reproduce all known properties of nuclear matter. We calculate the nucleon self-energy and the density-dependent effective NN and N{Δ} cross sections in a nuclear medium. Results show a sizable reduction of the {Δ} (pion) production cross section and important changes in the {Δ} absorption cross sections.