Enabling comparison of UrQMD with Geant4 hadronic models

TL;DR

This paper introduces a tool for comparing the UrQMD reaction code with Geant4 hadronic models, demonstrating UrQMD's superior performance in reproducing certain pion production data at various energies.

Contribution

A novel tool was developed to enable direct comparison between UrQMD and Geant4 hadronic models, facilitating better model validation and selection.

Findings

UrQMD better reproduces charged pion production for p+Cu and Pb interactions.

UrQMD shows improved agreement with experimental data at multiple energies.

The tool allows seamless processing of UrQMD output within Geant4 framework.

Abstract

Geant4 has an abundant set of physics models that handle the diverse interaction of particles with matter across a wide energy range. However, there are also many well established reaction codes currently used in the same fields where Geant4 is applied. One such code is the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model. In order to take advantage of the UrQMD code, we create a tool to enable comparisons among UrQMD and Geant4 hadronic models. This tool allows a user to process the output file of UrQMD through Geant4 toolkit, while at the same time, can choose among different Geant4 hadronic model generators. As an example, the UrQMD model is compared with the HARP-CDP experimental data and with the Binary and FRITIOF generators, in the framework of Geant4. It is shown that the UrQMD model can better reproduce charged pion production for p+Cu and Pb interactions at 3, 8 and 15 GeV/c, and is a good candidate for Geant4 hadronic models.