Measurement of Neutron Spectrum in Medium Containing Hydrogen

Two benchmarks were established. One is moderation shell containing hydrogen which is 34 cm in diameter. The other is composed of the shell and polyethylene cylinder of 24 cm×30 cm which are combinatorial. Measurement of neutron energy spectrum above 1 MeV changing with different positions of the experimental assemblies were carried out for incident neutrons from outside using d-T fusion source of accelerator. Meanwhile, the spectra were transformed integral spectrum. The scintillation detector of stilbene crystal of 18 mm×20 mm was used to measure neutron spectrum. At 0.95 level of confidence, the uncertainty of the measurement is 4.8%.