Abstract
The isobar-doorway model is used to parametrize the pion-nucleus optical potential so as to take into account the interaction of the D with other nucleons as well as coupling to inelastic and reaction channels. The parameters of the model are determined by fitting elastic scattering angular distributions. It is found that the nonlocality associated with the isobar propagation is important in the resonance energy region. This may indicate that the use of impulse approximation in obtaining the pion optical potential may be doubtful even if we introduce a complex shift in the energy at which the pion-nucleon scattering amplitude is evaluated to get a first-order optical potential.
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