Extension of the Intranuclear Cascade Model for Photonuclear Reactions at Energies up to 10 GeV

The intranuclear cascade (INC) model for photonuclear reactions has been extended at energies up to 10 GeV. To this end a phenomenological method for exclusive description of the elementary γN-interaction has been developed taking into account both the resonance contribution from the two-body channels γN → πB∗ and γN → M∗N (B∗ and M∗ being baryon and meson resonances) and the non-resonant statistical contribution from multibody channels γN → iπN (2 ⩽ i ⩽ 8). This method well describes a wide range of γN data up to Eγ ∼ 10 GeV. The INC model takes into account rescattering and absorption in a nucleus of pions, nucleons, and η-, ϱ-, ω-mesons generated in the γN-interaction. The evaporation, fission and multifragmentation of highly excited residual nucleus have also been taken into account. As a result of the Monte Carlo simulation an event of γA-reaction is generated which contains mesons, nucleons, nuclear fragments, fission fragments and final nuclide. The model well describes the available data on meson production and proton emission obtained with quasi-monochromatic photons.