Measurement and Analysis of Leakage Neutron Spectrum from Gallium Sample

Based on the neutronics integral experimental setup at China Institute of Atomic Energy, the leakage neutron spectra from gallium samples were measured by time-of-flight technique with a BC501A scintillation detector. For the benchmark analysis of the neutron evaluated nuclear data of gallium, the leakage neutron spectra were simulated by MCNP 4C code with the ENDF/B-Ⅶ.1, JEFF-3.2 and TENDL-2015 evaluated nuclear data libraries and compared with experimental data and TALYS code calculated results. The results show that the measured data are well reproduced by simulation with the TENDL-2015 library below the 9 MeV. The calculation results of JEFF-3.2 and TENDL-2015 libraries give better agreement with the measured data in the elastic scattering energy region. For the inelastic scattering peak around 12 MeV, JEFF-3.2 library shows a better agreement with the measured data, and TALYS results indicate that the contribution of discrete levels is dominated contribution.