An optimized design for a recoil-proton-detector system is studied to measure (n, xn) cross sections of incident energies up to 300 MeV. The detector system is composed of a radiator to convert a neutron into a recoiled proton and a phoswich-type detector to detect the recoiled proton. The radiator is made of an NE213 liquid organic scintillator. The phoswich-type detector includes a BGO scintillator surrounded by an NE102A plastic scintillator. Optimal design is investigated by varying dimensions of the radiator and the phoswich detector. Calculations of detector properties are performed by the PHITS. The detector system is shown to have a capability to measure (n, xn) cross sections effectively.
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