Two-nucleon photon absorption on 3He in the Δ(1232) region

Cross sections were determined in the Δ(1232) excitation region for the reactions 3H(γ,p)pn and 2H(γ,p)n at several photon energies and proton emission angles. Inclusive proton spectra were measured with a magnetic spectrometer, using quasimonochromatic e+-annihilation photons. The 3He data can be mainly accounted for by predictions assuming photon absorption by a pair of nucleons, except in the high-momentum part of the proton spectra. They clearly indicate the need for additional contributions, such as three-body absorption mechanisms