The Geant4 hadronic physics sub-library includes an extended set of models for highand low-energy hadronic interactions. We report on recent developments in the Geant4 nuclear de-excitation module, which is used by many Geant4 models to simulate the de-excitation of nuclear recoils produced in nuclear reactions. These processes significantly influence hadronic shower shape and energy deposition. We present the structure of the de-excitation module, and compare Geant4 predictions with thin-target experimental data, using different Geant4 hadronic physics models. These comparisons are performed for Geant4 version 11.3, which was publicly released in December 2024.
Chalyi et al. (2025) studied this question.