Neutron Spectrometry with EJ299-33 Plastic Scintillator for ${E_n} = 10 ! - ! 100 ~\hbox {MeV}$

A neutron spectrometer based on a single EJ299-33 plastic scintillator (5 cm diameter × 5 cm) is described. A digital implementation of pulse shape discrimination is used to separate events associated with neutrons from those associated with gamma-rays. Measurements made using a ns-pulsed neutron beam are used to produce response functions of the detector for neutrons over the energy range 10 - 100 MeV. These lineshapes are used to test the capability of the spectrometer to produce neutron energy spectra, via the unfolding of pulse height spectra, for use in neutron fields having any type of time structure. The results are compared with those from a similar spectrometer constructed from EJ301 liquid scintillator.