Simulation and parameterisation of spallation neutron distributions

We aim to produce a simple model to predict the numbers and properties of spallation neutrons. We chose a lead target of close to optimal dimension that is 30 cm long and 30 cm in radius and performed simulations of neutrons produced by a beam of proton incident on the target. The beam energy ranges from 100 MeV to 1400MeV. We chose two programs MCNPX and Geant4 and compared the results against each other. The investigations shows good agreement between the two programs for the overall numbers, energy spectra, spatial and radial distribution. Finally we produced a parametrized form which can be used for the neutronics studies in the reactor cores.

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