THE CALCULATION OF THE ANGULAR DISTRIBUTIONS AND THE NEUTRON ENERGY SPECTRA ON Pb, U, W TARGETS WITH ENERGY OF ACCELERATOR FROM 50 MeV TO 350 MeV

For the design of ADS (Accelerator Driven System) [1], it is important to study neutron spectra and details of nuclear reactions induced by neutrons. Furthermore, neutron energy and angular distribution data are important for a correct simulation of the propagation of particles inside a spallation target and the geometrical distribution of the outgoing neutron flux.
Many experimental results were available for thin targets [2] and massive targets additional studies of neutron spectra and neutron production were investigated to design target for ADS with incident proton energies up to 3 GeV [3].
In our study, the angular distribution and the neutron energy spectra are reported for the (p,n) reaction on target nuclei such as Pb, U, W with energy from 50 MeV to 350 calculated using database of JENDL-HE 2007. We obtain a set of data about the angular distribution and energy spectra of produced neutrons on some heavy targets with energy ranges as stated above.