Measurement and calculation of leakage neutron spectra from 238U induced by broad-spectrum neutrons

Leakage neutron spectra from a pure 238U slab sample (dimensions: 100 mm 100 mm 20 mm) bombarded by broad-spectrum neutrons were measured at 0 using the time-of-flight method. The experiment was carried out at the Radioactive Ion Beam Line of the Heavy Ion Research Facility in Lanzhou at the Institute of Modern Physics, Chinese Academy of Sciences. Broad-spectrum neutrons were generated by bombarding a tungsten target with 80.5 MeV/u 12C ions. Additionally, calculations were performed in GEANT4 with the INCL, BIC and BERT physics models, in combination with the evaluated nuclear data libraries ENDF/BVIII, JEFF-3.3, and JENDL-4.0, and the theoretical results for the leakage neutron spectrum of the 238U were obtained under the same experimental conditions. The results indicate that the GEANT4 calculations can reasonably reproduce the experimental data.