Abstract
The azimuthal angular distribution of the photoprotons produced in the reaction $^{12}\mathrm{C}(\ensuremath{\gamma}, {p}_{0})^{11}\mathrm{C}$ by monochromatic polarized gamma rays from $^{3}\mathrm{T}(p, \ensuremath{\gamma})^{4}\mathrm{He}$ was measured for gamma-ray energies of 21.3 and 21.6 MeV. The ratio $R$ of the number of photoprotons with directions between 0\ifmmode^\circ\else\textdegree\fi{} and 45\ifmmode^\circ\else\textdegree\fi{} (with respect to the gamma-ray polarization) to the number between 45\ifmmode^\circ\else\textdegree\fi{} and 90\ifmmode^\circ\else\textdegree\fi{} was determined. The average observed ratio for $R$, 2.8\ifmmode\pm\else\textpm\fi{}0.7, is larger than but not inconsistent with that calculated for pure electric-dipole photon absorption, 2.08\ifmmode\pm\else\textpm\fi{}0.1.
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