Abstract
The P-wave pion-nucleus optical potential ∼ ϱ 2( R) which derives from P-wave pion absorption on two nucleons is constructed using several πNN absorption models with pion- (and ϱ-) rescattering through the 33-resonance. A local-laplacian optical-model study of π- 12C scattering in the energy interval 60 MeV ⩽ T π ⩽ 120 MeV including this additional absorptive potential indicates sizeable but parameter-sensitive increases in the reaction cross section for low T π .
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