Medium Effects in Coherent Pion Photo- and Electroproduction on 4He and 12C
arXiv:nucl-th/9906019 · doi:10.1016/S0375-9474(99)00412-1
Abstract
Coherent pi0 photo- and electroproduction on 4He and 12C nuclei is investigated in the framework of a distorted wave impulse approximation in momentum space. The elementary process is described by the recently developed unitary isobar model. Medium effects are considered by introducing a phenomenological Delta self-energy. The recent experimental data for 4He and 12C can be well described over a wide range of energies and emission angles by the assumption that the Delta-nuclear interaction saturates.
18 pages LaTeX including 7 postscript figures