Production of slow neutrons using Doppler-shifting from a high-speed rotor and their application in fundamental research

A high-speed rotor with a Bragg scattering crystal in operation at a pulsed spallation source has produced cold (v < 30 m/s) and ultracold neutrons (v < 7 m/s) with spatial densities near to those observed at the highest flux reactors. Prospects are discussed for even higher fluxes at the LANSCE facility being commissioned at Los Alamos. Though the rotor is naturally matched to pulsed sources, prospects for producing short bursts, or on the other hand, continuous beams of slow neutrons may have application at reactors as well. 14 refs., 1 fig