Compton scattering cross sections from ${}^{12}\mathrm{C}$ have been measured at scattering angles of ${\theta }_{\gamma }=35\mathrm{}°-150°$ using tagged photons of $E_{\gamma }=84\mathrm{}-105$ MeV. Attempts to extract nucleon polarizabilities from the data were hampered by model ambiguities. These included uncertainties in the strength of the electric quadrupole and quasideuteron total photon absorption channels, and in the parametrizations of meson-exchange effects and nuclear form factors. These ambiguities led to large variations in the extracted values of the effective polarizabilities of the bound nucleon. Inelastic Compton scattering cross sections from the 4.44 MeV first-excited state were also obtained.

• Received 19 January 2001

DOI:https://doi.org/10.1103/PhysRevC.64.014603