Simulating the MARS Detector Response to a Cf-252 Source

The COHERENT experiment is designed to measure neutrino scattering at tens of MeV on various nuclear targets. COHERENT is the first experiment that has successfully measured the coherent elastic neutrino-nucleus scattering interaction in multiple detectors using neutrinos produced by the Spallation Neutron Source at Oak Ridge National Laboratory. However, neutron signals are a background for the COHERENT detectors. To address this, there is a dedicated neutron monitoring system: the Multiplicity and Recoil Spectrometer (MARS). This work describes an effort to model the Cf-252 neutron source as a calibration source using a GEANT4 simulation. The simulation generates neutron and gamma energy deposit data for the MARS neutron-monitoring detector to compare to previously collected calibration data to model the MARS detector's response.