A phenomenological analysis of antiproton interactions at low energies

We present an optical potential analysis of the p̄p interactions at low energies. Our optical potential is purely phenomenological, and has been parametrized on data recently obtained by the Obelix Collaboration at momenta below 180 MeV/c. It reasonably fits annihilation and elastic data below 600 MeV/c, and allows us for an evaluation of the elastic cross section and ρ−parameter down to zero kinetic energy. Moreover we show that the mechanism that depresses p̄−nucleus annihilation cross sections at low energies is present in p̄p interactions too.