INFLUENCE OF THE PION-NUCLEON INTERACTION ON THE COLLECTIVE PION FLOWIN HEAVY-ION REACTIONS

We investigate the influence of the real part of the in-medium pion op tical potential on the pion dynamics in intermediate energy heavy ion reactions at 1 GeV/A. For different models, i.e. a phenomenological mo del and the Delta-hole model, a pionic potential is extracted from the dispersion relation and used in quantum molecular dynamics calculatio ns. In addition to the inelastic scattering processes we thus take car e of both real and imaginary parts of the pion optical potential. A st rong influence of the real pionic potential on the pion in-plane flow is observed. In general, such a potential has the tendency to reduce t he anticorrelation of pion and nucleon Row in non-central collisions.