Experiment on uranium slabs of different thicknesses with D-T neutrons and validation of evaluated nuclear data

In order to validate the evaluated nuclear data for 238U, leakage neutron spectra from pure 238U slab samples of different thicknesses bombarded with 14.8 MeV D-T neutrons were measured at 60 ° (for 10 cm × 10 cm × 2 cm, 10 cm × 10 cm × 5 cm, 10 cm × 10 cm × 11 cm samples) and 120 ° (for 10 cm × 10 cm × 5 cm, 10 cm × 10 cm × 11 cm samples) respectively. The measurement was performed at China Institute of Atomic Energy using time-of-flight method. Monte Carlo simulations were carried out by MCNP-4C code combined with various evaluated nuclear data libraries, namely, ENDF/B-VII.1, JENDL-4.0, CENDL-3.1, JEFF-3.2 and TENDL-2015. The experimental results were compared with the corresponding calculated ones, and the calculation-to-experiment ratio (C/E) which indicates the agreement between them was obtained. The results show that the JENDL4.0 fitted the experimental data best.