The Pion-Nucleus Interaction and Pionic Atoms

We have derived a relativistic impulse approximation to calculate the relativistic DKP pion-nucleus optical potentials, using the Duffin-Kemmer-Petiau (DKP) wave equation. We give a systematic comparative analysis of our DKP relativistic pion-nucleus optical potential with typical non-relativistic models available in the literature. We compare these models by looking at their respective prescriptions for the real and absorptive, S-wave and P-wave, isoscalar and isovector, pieces of the pion-nucleus optical potentials.