Data analysis of an experiment in which photon splitting in atomic fields was observed is presented. The experiment was performed at the tagged photon beam of the ROKK-1M facility at the VEPP-4M collider. In the energy region of 120-450 MeV, statistics of 1.6x10(9) photons incident on the BGO target was collected. About 400 candidate photon-splitting events were reconstructed. Within the attained experimental accuracy, the experimental results are consistent with the calculated exact atomic-field cross section. The predictions obtained in the Born approximation differ significantly from the experimental results.
The differential cross section of Delbrück scattering is measured on a bismuth germanate (Bi4Ge3O12) target at photon energies 140 ÷ 450 MeV and scattering angles 2.6 ÷ 16.6 mrad. A good agreement with the theoretical results, obtained exactly in a Coulomb field, is found.
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