BETA-DELAYED NEUTRON EMISSION IS A DOMINANT DECAY MODE FOR VERY NEUTRON-RICH NUCLEI. THE MEASUREMENT OF NEUTRON ENERGIES PROVIDES THE DATA USED TO CONSTRAINS NUCLEAR STRUCTURE THEORIES AND IS REQUIRED FOR R-PROCESS MODELING, ESPECIALLY WHEN EXTRAPOLATIONS ARE NEEDED FOR NUCLEI, WHICH CANNOT BE MEASURED. WITHIN THIS PROJECT, UTK WILL CONTINUE RESEARCH WITH VANDLE, AND NEXT NEUTRON DETECTOR ARRAYS DEVELOPED PREVIOUSLY WITHIN SSAA PROGRAMS. THE VANDLE ARRAY WILL BE A CORE NEUTRON DETECTOR FOR THE FRIB DECAY STATION INITIATOR. IT WILL BE USED IN EXPERIMENTS AIMING FOR NEUTRON SPECTROSCOPY ON VERY EXOTIC NUCLEI: FISSION FRAGMENTS AND LIGHT DRIP-LINE NUCLEI. THE NEXT ARRAY WILL BE IMPLEMENTED IN FLEXIBLE CONFIGURATIONS IN THE EXPERIMENTS IN OTHER FACILITIES SUCH AS ANL, RIKEN, AND CERN. THEY WILL COMPARE MEASURED DATA ON BETA-DELAYED NEUTRON EMISSION WITH THE PREDICTIONS OF THE NUCLEAR MODELS, WHICH USE SHELL-MODEL TO CALCULATE BETA DECAY STRENGTH DISTRIBUTION AND STATISTICAL MODEL FOR NEUTRON EMISSION. THE SENSITIVITY TO THE CHOICE OF SHELL MODEL PARAMETERS, OPTICAL MODEL PARAMETERS, AND LEVEL DENSITIES WILL BE INVESTIGATED. THIS PROPOSAL FOCUSES ON VERIFYING THE VALIDITY OF THE COMPOUND NUCLEUS HYPOTHESIS IN BETA DELAYED NEUTRON EMISSION MODELING. THEY WILL ALSO IMPROVE THE SIGNAL PROCESSING AND ANALYSIS METHODS FOR THE RECENTLY CONSTRUCTED NEXT DETECTOR'S PERFORMANCE TO EXPLOIT ITS FULL POTENTIAL. THEY WILL BUILD AND INVESTIGATE THE PERFORMANCE OF NEXT NEUTRON DETECTOR MODULE USING NEW SCINTILLATOR MATERIAL TO IMPROVE NEUTRON DETECTION EFFICIENCY FOR FUTURE NEUTRON ARRAYS.