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Theoretical Analysis of Positive Pion Production on 12C by 185 MeV Protons

Calculations of positive pion production on 12C leading to the 1p1/2, 2s1/2 and 1d5/2 states in 13C are performed in a one-nucleon reaction model. Distorted waves are used to describe the proton and the pion. A certain agreement is found with experimental data. The choice of pion-nucleus optical potential is crucial for the result of the calculations.