An unsuppressed array for gamma-ray coincidence measurements following neutron-induced reactions

A four-detector array was developed for measuring gamma-gamma coincidencesfollowing inelastic neutron scattering--i.e., the (n, n ' {gamma}) reaction--with accelerator-produced neutrons. Following our initial success in these measurements, this array was moved to the Weapons NeutronResearch (WNR) area at the Los Alamos NeutronScience Center (LANSCE) for coincidencemeasurements with higher-energy neutronsfrom the LANSCE/ WNR unmoderated neutron spallationsource. Additional measurements with monoenergetic accelerator-produced neutronswith energies up to 24 MeV are in progress at the University of Kentucky.