New Geant4 photonuclear cross-section model

A new photonuclear cross-section model for the Geant4 toolkit is presented. The model is based on IAEA evaluated photonuclear data library at giant dipole resonance energy region from 0 MeV to 130 MeV. Description of processing algorithm of IAEA ENDFL-6 data files to the Geant4 database is provided. Overview of the new class and comparison of the model cross-section output with experimental data and the previous implementation of photonuclear cross-sections of Geant4 is presented. The new model will be publicly available with Geant4 11.0.