Measurements of the response functions of an NE213 organic liquid scintillator to neutrons up to 800 MeV

The neutron response functions of 12.7 cm diameter by 12.7 cm long NE213 organic liquid scintillator have been measured in the energy range from 50 to 800 MeV at the Heavy-Ion Medical Accelerator in Chiba (HIMAC). Neutrons were generated by the 800 MeV/nucleon Si ion and 400 MeV/nucleon C ion bombardment on a thick carbon target. Neutron energy was determined by the time-of-flight method with using the beam pick-up scintillator. The maximum light outputs were gradually increased with increasing incident neutron energy and the variation of the response functions have been observed up to 800 MeV. The experimental results show good agreement with other experimental results and the calculated values for incident neutron energy below about 200 MeV.