Spin excitation strength from proton inelastic scattering at zero degree

We have performed the 0 degree measurements of proton inelastic scattering for the 1+, T=0 (12.7 MeV) and 1+, T=1 (15.1 MeV) states in 12C at Ep=100, 200, 300, 400 MeV. The ratio of the excitation cross sections for these two states significantly deviates from the estimation of the distorted wave analysis, suggesting that the effective interactions VτT or Vσ might be modified to reproduce the experimental data.