Simulating the Neutron Detection Efficiency of the CLAS12 Detector

We have studied the expected performance of the CLAS12 detector that will be built at Jefferson Lab as part of the 12-GeV Upgrade. The Upgrade hopes to further our understanding of the internal structure of nucleons and nuclei by studying properties such as form factors and generalized parton distributions. The initial round of experiments for the Upgrade include ones requiring neutron detection and we are studying the neutron detection efficiency (NDE) in preparation for such experiments. A precise knowledge of the NDE is required to keep systematic uncertainty low. We studied the CLAS12 performance by generating the four-momenta of an electron and neutron after a relativistic, elastic collision and passing this information into the GEANT4-based program gemc. This code uses the four-momenta of these particles and simulates their interaction with the CLAS12 components. Events were reconstructed with the program Socrat. By comparing the number of measured elastically-scattered, electron-neutron coincidences to the number of elastic electrons detected in the simulation we extracted the NDE of the time-of-flight (TOF) scintillators. In previous work we studied one set of TOF panels and have now extended this work to include the full array of TOF scintillators in the simulation and expanded the neutron momentum range.