Dr Paolo Dondero (SWHARD SRL)
AREMBES (ATHENA Radiation Environment Models and X-Ray Background Effects Simulators) is the new ESA software simulator designed for the ATHENA mission. It is created within the CIRSOS simulation framework to fully address the radiation background issues encountered by Athena and to be adaptable to other future X-ray missions. Within this framework the correct and precise simulation of all relevant physical processes contributing to the background estimation is a key ingredient, entirely based on Geant4. A wide effort has been dedicated by the AREMBES team to identify the best possible physics models for space applications implemented into Geant4 and prepare a physics list “space dedicated” to be used in the AREMBES simulator. In the present contribution the relevant components of this physics list will be presented, focusing on the motivation of each choice, together with the physics list definition.