Cross sections, $\frac{d^2\sigma }{d\Omega \mathrm{dT}}$, on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{40,44,48}{}_{}{}^{}\mathrm{Ca}$ are presented for inclusive (${\pi }^{+}$,${\pi }^{-}$) and (${\pi }^{-}$,${\pi }^{+}$) reactions at an incident energy of $T_{\pi }=290\mathrm{}$ MeV with the exit pions detected over an energy range of $T_{\pi }=175-255\mathrm{}$ MeV at an angle of 60°. These cross sections are found to vary systematically with reported proton-neutron differences in nuclear radial distributions.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{40,44,48}{}_{}{}^{}\mathrm{Ca}$ (${\pi }^{\pm }$,${\pi }^{\mp }$); measured $\frac{d^2\sigma }{d\Omega \mathrm{dT}}$, $T=290\mathrm{}$ MeV, $\theta =60\mathrm{}°$, nondiscrete final states; discussed the sensitivity to proton-neutron differences.

• Received 21 June 1979

DOI:https://doi.org/10.1103/PhysRevC.20.1946