Fast neutron beams--prospects for the coming decade

Abstract

The present status of neutron beam facilities above 20 MeV is reviewed. Presently, two main techniques for neutron production at these energies are used; white beams and quasi-monoenergetic beams. The performances of these two techniques are discussed, as well as the use of such facilities for measurements of nuclear data for fundamental and applied research. Recently, two novel ideas on how to produce extremely intense neuton beams in the 100-500 MeV range have been proposed. Decay in flight of beta-delayed neutron-emitting nuclei could provide beam intensities five orders of magnitudes larger than present facilities. A typical neutron energy spectrum would be essentially mono-energetic, i.e., the energy spread is about 1 MeV with essentially no lowenergy tail. A second option would be to produce beams of 6 He and dissociate the 6 He nuclei into α particles and neutrons. The basic features of these concept are outlined, and the potential for improved nuclear data research is discussed.