Differential cross sections for the reaction ${}_{}{}^2{}_{}{}^{}\mathrm{H}(\gamma , p)n$ were measured at five laboratory angles, from 32° to 130°, for photon energies 100, 140, 180, and 220 MeV. A quasimonochromatic photon beam was used and the photon spectrum was measured on line by a pair spectrometer. The absolute normalization uncertainty is within ±5%. Data agree within the total errors with the recent results of a tagged-photon experiment and of a measurement of the inverse process.

• Received 26 November 1984

DOI:https://doi.org/10.1103/PhysRevLett.54.1639