P oS(Baldin ISHEPP XXII)046 Multifragment break-up of 12C in photonuclear

The absorption of ∼ 1 GeV photons by light and heavy nuclei is simulated by means of the RELDIS model based on the intranuclear cascade and Fermi break-up models. The average ex-citation energy of residual nuclei created after the photoabsortion on 12C is estimated at the level of 2.5–3 MeV per nucleon, which is essentially higher compared to the photoabsorption on heavy nuclei. It was found that a complete fragmentation of 12C into 12 nucleons is observed typically once per 5000 events. Measured multiplicity distributions of produced fragments are well de-scribed by the model. As confirmed by preliminary data obtained by the GRAAL collaboration, multifragment decays of light nuclei can be seen in reactions induced by 700–1500 MeV photons