Abstract
The excitation function for the (${\mathrm{\ensuremath{\pi}}}^{+}$,${\mathrm{\ensuremath{\pi}}}^{0}$) 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 \ensuremath{\pi}N 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.
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