The absolute ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(\gamma ,{\mathrm{p}}_0){}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ cross section was measured in the energy region of the giant dipole resonance. The magnitude of our 90° differential cross section, which has an absolute uncertainty of about 12%, is in disagreement with the one obtained by detailed balance from a recent ($\mathrm{p},{\gamma }_0$) measurement, but is in reasonable correspondence with the combined data from the Argonne and Stanford groups.

• Received 1 August 1983

DOI:https://doi.org/10.1103/PhysRevC.29.2061