The KENS shielding experiment for high energy neutrons

In order to obtain experimental data for benchmark of particle transport Monte Carlo codes, we performed a shielding experiment with high-energy neutrons produced from a tungsten target bombarded with 500-MeV protons and penetrated through a concrete shield in the 0 degree direction. Using an activation method, we observed many radioactive products induced by the neutrons with energies ranging from thermal to 500 MeV and obtained their production yields from various target elements at depths of 0 to 4 m from the surface of the concrete shield. We could see an attenuation of the neutrons indirectly from the variation of the production yields. (author)