N*electroproduction and propagation in nuclei

We have measured the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${\gamma }^{\mathrm{*}}$,${\mathrm{\pi }}^{\mathrm{-}}$p${)}^{11}$ ${\mathrm{C}}_{\mathrm{g}.\mathrm{s}.\mathrm{}}$ cross section using virtual bremsstrahlung at three points at invariant masses of 1444 and 1530 MeV. At low neutron initial momentum (${\mathit{p}}_{\mathit{m}}$≊60 MeV/c) and large ${\mathit{N}}^{\mathrm{*}}$ momentum (${\mathit{p}}_{\mathit{N}}^{\mathrm{*}}$≊750 MeV/c) the measured cross section is at or below the distorted wave impulse approximation (DWIA) calculation. At larger initial momentum (${\mathit{p}}_{\mathit{m}}$≊220 MeV/c) and smaller ${\mathit{N}}^{\mathrm{*}}$ momentum (${\mathit{p}}_{\mathit{N}}^{\mathrm{*}}$≊500 MeV/c), the measured cross section is almost twice as large as the DWIA calculation. This discrepancy might be due to ${\mathit{N}}^{\mathrm{*}}$-nucleus interactions.