The cross section for the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(\overline{p},\overline{p}n){}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ reaction measured at 1.73 GeV is 28.2 ± 3.6 mb, a value virtually identical with that of the corresponding proton-induced reaction (27.5 ± 0.6 mb). The ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({\pi }^{-},{\pi }^{-}n){}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}({\pi }^{-},{\pi }^{-}n){}_{}{}^{18}{}_{}{}^{}\mathrm{F}$ cross sections at 2.36 GeV are 19.4 ± 1.5 and 16.0 ± 2.0 mb, respectively. Each is about 25% lower than the corresponding reaction induced by 2.4-GeV protons. These results are discussed in terms of the free-particle cross sections.

• Received 8 December 1970

DOI:https://doi.org/10.1103/PhysRevC.3.1538