Measurement of neutron spectra produced in the forward direction from thick graphite, Al, Fe and Pb targets bombarded by 350 MeV protons

Neutron energy spectra at 0-degree produced from stopping-length graphite, Al, Fe and Pb targets bombarded by 350 MeV protons were measured at the neutron TOF course at RCNP of Osaka University. The experiments were performed by the time-of-flight technique with the flight path length of 11.4 and 95 m, and neutron energy spectra were obtained in the energy range from 10 MeV upto the maximum energy 350 MeV. Monte Carlo calculations by MCNPX, PHITS and MARS15 were performed to compare the obtained experimental data, and these simulation results at 0-degree generally underestimated the experimental data for all targets in the energy range above 20 MeV.