Interfacing ACHILLES and GENIE for Improving Neutrino-Nucleus Interaction Simulations in ICARUS

Precise modeling of neutrino-nucleus interactions is essential for advancing nuclear physics. This project enhances the accuracy of event generation for the ICARUS detector by interfacing ACHILLES (A CHIcago Land Lepton Event Simulator), a theory-driven lepton-level event generator, with GENIE (Generates Events for Neutrino Interaction Experiments), the robust and widely used neutrino event generator framework. ACHILLES offers advanced neutrino-nucleon modeling and high-precision cross-section calculations based in nuclear theory, while GENIE incorporates experimental realism through consideration of the detector geometry. By integrating ACHILLES into GENIE's event generation pipeline, we replace empirical spline fits with more rigorous theoretical input while retaining GENIE's ability to model detector effects. Differential cross-section and final-state muon energy distributions generated using the interface demonstrate clear deviations from pure GENIE predictions, consistent with the expected nuclear modeling differences. This hybrid approach leveraging physical accuracy and experimental realism contributes directly to the ICARUS experiment and lays a foundation for more reliable nuclear modeling in future lepton-nucleus interaction studies.