The excitation function for the (${\mathrm{\pi }}^{+}$,${\mathrm{\pi }}^0$) reaction on ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ to analog states in ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ and ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ in the range of 250 to 650 MeV pion kinetic energy is calculated. The Glauber model with microscopic shell-model wave functions is used. The effects of antisymmetry and spin flip were explicitly evaluated; experimental πN partial waves up to l=3 were included in the calculation. The calculated cross section is too large compared to experiment. The effects of two- and three-body pion absorption are calculated and found to reduce the calculated cross section by a small amount to values nearer experiment.

• Received 23 July 1990

DOI:https://doi.org/10.1103/PhysRevC.42.2454