Large-angle excitation functions for ${\mathrm{\pi }}^{+}$ scattering on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ are calculated by using the theoretical optical potentials based on the α-particle model of nuclei. The results show that considerably improved agreement with the experimental data over the Kisslinger-type optical model calculations is obtained.

• Received 8 September 1989

DOI:https://doi.org/10.1103/PhysRevC.41.2449