Abstract
The calculations to the standard thick target were made by using different codes. The simulation of the thick Pb target with length of 60cm, diameter of 20cm bombarded with 800, 1000, 1500, and 2000MeV energetic proton beam was carried out. The yields and the spectra of emitted neutron were studied. The spallation target was simulated by SNSP, SHIELD, DCM\\CEM (Dubna Cascade Model \\Cascade Evaporation Mode), and LAHET codes.The simulation results were compared with experiments. The comparisons show good agreement between the experiments and the SNSP simulated leakage neutron yield. The SHIELD simulated leakage neutron spectra are in good agreement with the LAHET and the DCM\\CEM simulated leakage neutron spectra.
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