50 MeV pion inelastic scattering to the 1/sup +/ doublet in /sup 12/C

Cross sections have been measured for the excitation of the 12.71 MeV, T = 0, and 15.11 MeV, T = 1, 1/sup +/ states in /sup 12/C by 50 MeV ..pi../sup +- / scattering. The cross section ratio, R = ..sigma..(12.7 MeV)..sigma..(15.1 MeV), was found to be 7.5 +- 1.5 for ..pi../sup +/ and 6.6 +- 1.5 for ..pi../sup -/ at 50 MeV, giving an isospin averaged value of R = 7.05 +- 1.06. These results indicate that the anomalous behavior of R is attributable to the energy dependence of the T = 1 1/sup +/ level. The data also indicate that the impulse approximation is probably invalid at 50 MeV, contrary to the conclusions of a recent study at 65 MeV