Abstract
A pion optical potential is constructed which incorporates the \ensuremath{\Delta} dynamics found to be important in \ensuremath{\Delta}-hole analyses of pion scattering from light nuclei. These dynamics include \ensuremath{\Delta} propagation, binding and Pauli blocking, and a \ensuremath{\Delta} spreading potential. We employ a local density approximation for the medium-modified \ensuremath{\Delta} propagator, resulting in a computationally flexible tool for the analysis of pion-nucleus data. We reproduce the \ensuremath{\Delta}-hole results for \ensuremath{\pi}${\mathrm{\ensuremath{-}}}^{16}$O scattering satisfactorily. Elastic ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$${\mathrm{\ensuremath{-}}}^{208}$Pb scattering is described very well with the same strongly damping spreading potential found for light nuclei. The pion wave functions in the medium are substantially modified by the \ensuremath{\Delta} dynamics.
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