Optimizing the MoNA Sweeper ion-optical transfer matrix for enhanced energy and angular resolution*

The decay energy of neutron unbound states can be reconstructed from measurements of the four-momenta of the decay products using an ion-optical matrix. This study focuses on the optimization of the ion-optical transfer matrix to improve the energy and angular resolution of the large gap Sweeper magnet system used by the MoNA Collaboration. The matrix allows to reconstruct  (x, θx, y, θy) for each fragment from their positions on the two Cathode Readout Drift Chambers (CRDCs). The refinement of matrix elements allows for the improved reconstruction of particle trajectories, enabling more precise analysis and characterization of reaction products. The matrix calculations were validated through simulation studies; and tungsten mask runs were utilized to adjust the matrix elements based on patterns measured on the segmented target tetra lateral position silicon detectors (TLPSDs) and CRDCs. Results from this study will be presented and discussed.