Numerical simulation of distribution of recoil proton in plastic scintillating fiber irradiated by high-energy neutron

Through Geant4 simulation, the characteristics of recoil proton in plastic scintillating fibers irradiated by high-energy neutrons have been presented. The energy and angular distributions of recoil proton have been analyzed with incident neutron energy of 2, 4, 6, 8 MeV. The results show that the energy of the recoil proton ranges from zero to incident neutron energy. The recoil proton energies vary inversely as angles, that is, the protons along the direction of incident neutrons have the biggest energy and those along the fiber radius have relative smaller energy.