Comparison of Neutron Removal fromLi7byπ±with Free Pion-Nucleon Results

Total cross sections for the knockout reactions ${}_{}{}^7{}_{}{}^{}\mathrm{Li}({\pi }^{-},{\pi }^{-}n){}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}({\pi }^{+},{\pi }^{+}n){}_{}{}^6{}_{}{}^{}\mathrm{Li}$ to 3.56-MeV $0^{+}$ $T=1\mathrm{}$ state have been measured at ten energies between 50 and 290 MeV by detecting the direct $\gamma$ de-excitation. As found in previous work, the ratio $\frac{\sigma ({\pi }^{-},{\pi }^{-}n)}{\sigma ({\pi }^{+},{\pi }^{+}n)}$ on the (3,3) resonance is significantly less than the value of 3 expected from free pion-nucleon results.