Abstract
Phenomenological fits to low-energy $\ensuremath{\pi}$-nucleus scattering have uniformly required a greatly enhanced $s$-wave repulsion in the optical potential, for which no satisfactory theoretical explanation has been given. Evaluation of nonlinear terms in field-theoretic Lagrangians with broken chiral symmetry and inclusion of necessary binding effects leads to a substantial, repulsive ${\ensuremath{\rho}}^{2}(r)$ potential, even on an isospin zero target. This potential may account for the previously unexplained effect.
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