Tagged fast neutron beams En > 6 MeV

Controlled flux of neutrons are produced through the N-14(d,n)O-15 nuclear reaction. Deuteron beams (2-4 MeV) are delivered by the CN-Van de Graaff accelerator and directed with full intensity to our Nitrogen target at SUGAR (SUpersonic GAs jet taRget). Each neutron is electronically tagged by the detection of the associated 15O. Its energy and direction are known and "beams" of fast monochromatic tagged neutrons (E-n>6 MeV) are available for basic research and applied work. MONDE is a large area (158 x 63 cm(2)) plastic scintillating slab (5 cm thick), viewed by 16 PMTs from the sides. Fast neutrons (MeV) entering the detector will produce a recoiling proton that induces a light spark at the spot. Signals from the 16 detectors are processed to deduce the position of the spark. Time logic signals from both the O-15 detector and MONDE are combined to deduce a time of flight (TOF) signal. Finally, the position information together with the TOF yields the full momentum vector of each detected neutron.