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We investigate the influence of the real part of the in-medium pion opticalpotential on the pion dynamics in intermediate energy heavy ion reactions at 1GeV/A. For different models, i.e. a phenomenological model and the$\Delta$--hole model, a pionic potential is extracted from the dispersionrelation and used in Quantum Molecular Dynamics calculations. In addition withthe inelastic scattering processes we thus take care of both, real andimaginary part of the pion optical potential. A strong influence of the realpionic potential on the pion in-plane flow is observed. In general such apotential has the tendency to reduce the anticorrelation of pion and nucleonflow in non-central collisions.Comment: 12 pages Latex, 4 PS-figure

Influence of the pion - nucleon interaction on the collective pion flow in heavy ion reactions