Excitation functions for inelastic scattering of ${\pi }^{-}$ from ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$ to the $1^{+}$ state at 10.2 MeV have been measured at constant momentum transfer $q=73\mathrm{}$ MeV/c. The incident energy was varied between 116 and 180 MeV. An upper limit was measured for the ${\pi }^{+}$ cross section at 116 MeV. The data are not fitted by distorted-wave impulse approximation calculations at this $q$ where the differential cross section is predicted to have its maximum. The discrepancy between theory and experiment is similar to the disagreement observed for ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(\pi ,{\pi }^{\prime }){}_{}{}^{12}{}_{}{}^{}\mathrm{C}(1^{+},15.1\mathrm{} \mathrm{MeV})$.

• Received 27 February 1984

DOI:https://doi.org/10.1103/PhysRevC.30.242