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Abstract
The reaction 3He( γ, p) n was measured at the ALS-Saclay at kinematics corresponding to mean neutron recoil momenta near 30 and 75 MeV. Differential cross sections were obtained for photon energies between E γ = 200 and 450 MeV at proton emission angles relative to the p− p center of mass of 49° and 75°, and a proton angular distribution was obtained at E γ = 350 MeV. The cross section for photon absorption by a p− p pair is found to be lower by two orders of magnitude compared to that for a p− n pair in 3He. Theoretical multiple scattering calculations reproduce the data rather well, except for significant discrepancies at low E γ and forward proton angles.
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