The small angle scattering of ${\pi }^{+}$ from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ was measured at 115, 167, and 242 MeV from 3 to 10°. These measurements covered the Coulomb-nuclear interference region. New values of the ${\pi }^{+}-{}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ total cross section have been used to extract the real part of the forward-scattering amplitude.

[NUCLEAR REACTION ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({\pi }^{+},{\pi }^{+})$, $E=115-242\mathrm{}$ MeV; measured $\sigma \left({\theta }_{\pi }\right)$; deduced $\frac{\mathrm{Re}{f}_N\left(0^{\circ }\right)}{\mathrm{Im}{f}_N\left(0^{\circ }\right)}$.]

• Received 10 October 1973

DOI:https://doi.org/10.1103/PhysRevC.9.1198