Spin effect of antiproton-nucleus inelastic scattering

If the antiproton optical potential includes the spin orbit interaction term, the A (p̄,p̄′)A * inelastic scattering not only can excite the normal parity states, but also can excite the abnormal parity states. It also induces a polarization P_f(θ) at the inelastic scattering. In the framework of DWIA, we derive and calculate the inelastic scattering cross section and P_f(θ) for the ¹²C(p̄,p̄′)¹²C* with 2⁺, 3^-, and 1⁺ states at antiproton energies of 46.8 and 179.7 MeV. Our model fit well the available experimental data. The 46.8 MeV measurement of the inelastic differential cross section to the 1⁺ abnormal parity state can be explained by a spin orbit term. Such a term generates a sizable inelastic scattering polarization.