Neutron spectrometry in a mixed field of neutrons and protons with a phoswich neutron detector - Part I: response functions for photons and neutrons of the phoswich neutron detector

We have developed a phoswich neutron detector consisting of an NE213 liquid scintillator surrounded by an NE115 plastic scintillator to distinguish ph oton and neutron events in a charged-particle mixed field. To obtain the en ergy spectra by unfolding, the response functions to neutrons and photons w ere obtained by the experiment and calculation. The response functions to p hotons were measured with radionuclide sources. and were calculated with th e EGS4-PRESTA code. The response functions to neutrons were measured with a white neutron sourer produced by the bombardment of 135 MeV protons onto a Be + C target using a TOF method, and were calculated with the SCINFUL cod e, which we revised in order to calculate neutron response functions up to 135 MeV. Based on these experimental and calculated results, response matri ces for photons up to 20 MeV and neutrons up to 132 MeV could finally be ob tained. (C) 2001 Elsevier Science B.V. All rights reserved.