The ($\pi ,N$) reaction, in which a meson deposits its total energy on a single nucleon, is examined for its effect on $\pi$-nuclear scattering. At energies from 30 to 75 MeV the reaction cross section is enhanced by about 10%, and the angular distributions are essentially unchanged. At higher energies the effects are smaller.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(\pi ,\pi )$, ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}(\pi ,\pi )$, $E=50-250\mathrm{}$ MeV. Pion-nucleus scattering. Theoretical optical potential. Meson annihilation reactions.

• Received 8 March 1976

DOI:https://doi.org/10.1103/PhysRevC.14.361