A profile and flux monitor for the few GeV neutron beam at KEK

Abstract We describe a neutron beam monitor in the few GeV region developed for an experiment of the n + p → d + γ differential cross section measurement at the KEK-PS. It was used to monitor the profile and the flux of the neutron beam. The detector is a 3-plane plastic scintillator hodoscope. We present the design and performance of the monitor. The detection efficiencies evaluated with various Monte Carlo simulation codes are compared to the results of the measurements.