A neutron detector for (p,np) coincidence studies

A neutron detector with moderate energy resolution (similar to 3 MeV) has b een built for neutrons in the energy range 75-175 MeV. The detector was des igned for coincidence scattering experiments. The design eliminates the nee d for long neutron flight paths necessary for comparable energy resolution time-of-flight measurements with a comparable efficiency-solid angle produc t (0.02 msr). The detector consists of thin plastic scintillators in which the neutron undergoes n-p elastic scattering. The second-scattered protons are tracked by drift chambers and detected in a sodium iodide array. The de sign motivations and features are presented along with results from detaile d in-beam experimental tests. (C) 1999 Published by Elsevier Science B.V. A ll rights reserved.