Forward nuclear amplitude for scattering of charged pions from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ nuclei has been calculated by extrapolation of the available data to the forward angle in the ($\frac{3}{2}, \frac{3}{2}$) resonance region. The analysis is independent of any nuclear model. The values of ${\sigma }_{\mathrm{el}}$, ${\sigma }_{\mathrm{inel}}$, and ${\left[\right(\frac{d{\sigma }_N}{d\Omega }\left)\right(0\mathrm{}°\left)\right]}_{\mathrm{el}}$ are reported. Substantial difference, indicative of Coulomb distortion, is found for oppositely charged pions.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({\pi }^{\pm }, {\pi }^{\pm })$, $T^{\mathrm{lab}}=115-280\mathrm{}$ MeV; calculated forward nuclear amplitude, ${\sigma }_{\mathrm{el}}$, ${\sigma }_{\mathrm{inel}}$, ${\left[\right(\frac{d{\sigma }_N}{d\Omega }\left)\right(0\mathrm{}°\left)\right]}_{\mathrm{el}}$, pole subtraction method.

• Received 25 March 1982

DOI:https://doi.org/10.1103/PhysRevC.26.2678