Development of the Fritiof Model in Geant4

New features are added to the Fritiof model implemented in Geant4: a simulation of elastic hadron-nucleon scatterings; a simulation of binary reactions like NN→N∆ in hadron-nucleon interactions; a separate simulation of single diffractive and non-diffractive events; the reggeon theory inspired model of nuclear destruction (RTIM) and the algorithm of “Fermi motion” simulation in nuclear reactions. These allow to describe after a parameter’s tuning the energy dependencies of pp-interaction reaction cross sections (pp→ppπ, pp→npπ, pp→ppππ, pp→np2ππ, pp→ppππ π) and the HARP-CDP data on pion and proton productions in the interactions of projectile protons with momenta 3, 5, 8, 12 and 15 GeV/c with Be, Cu, Ta and Pb targets. Thus a smooth transition between the low energy hadronic models of Geant4 (Bert, Bic) and the high energy QGS model of Geant4 can be provided.