Interfacing the JQMD and JAM Nuclear Reaction Codes to Geant4

Geant4 is a toolkit for the simulation of the passage of particles throughmatter. It provides a comprehensive set of tools for geometry, tracking,detector response, run, event and track management, visualization and userinterfaces. Geant4 also has an abundant set of physics models that handle thediverse interactions of particles with matter across a wide energy range.However, there are also many well-established reaction codes currently used inthe same fields where Geant4 is applied. In order to take advantage of thesecodes, we began to investigate their use from within the framework of Geant4.The first codes chosen for this investigation were the Jaeri Quantum MolecularDynamics (JQMD) and Jet AA Microscopic Transportation Model (JAM) codes. JQMDis a QMD model code which is widely used to analyze various aspects of heavyion reactions. JAM is a hadronic cascade model code which explicitly treats allestablished hadronic states, including resonances with explicit spin andisospin, as well as their anti-particles. We successfully developed interfacesbetween these codes and Geant4. These allow a user to construct a detectorusing the powerful material and geometrical capabilities of Geant4, while atthe same time implementing nuclear reactions handled by the JQMD and JAM modelsand the Hadronic framework of Geant4 proved its flexibility and expandability.