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Abstract
In order to validate the evaluated nuclear data, leakage spectra in the range of 0.8 to 15 MeV from samples were measured by time-of-flight (TOF) technique using a D-T neutron source. An experimental system for benchmark validation of nuclear data with slab samples has been set up at China Institute of Atomic Energy (CIAE). In this study, test samples are iron slabs, of which the thickness are 5cm, 10cm and 15cm, and the measured angles were chosen to be about 60° and 120°. By comparing measured leakage spectrum with calculated ones by MCNP-4C code, using the data from the CENDL-3.1, ENDF/B-VIII.0, JENDL-4.0 and JEFF-3.3 nuclear data files, and the comparison was made by the spectrum shape and by the C/E values in different energy regions.
Highlights
The benchmark experimental study on the fusion neutronics plays an important role for validating the accuracy of the evaluated nuclear data, especially the elements that are of interests in nuclear devices, fission and fusion reactors for technologies
The comparison of the measured spectrum and the corresponding one calculated by MCNP-4C with the ENDF/B-VIII.0 evaluated nuclear data can be found in Fig.3 and Fig.4, from which it can be observed that the experimental result is well reproduced by the calculated one in the whole neutron energy range
The contributions of different reaction channels to the leakage neutron spectra for iron at incident neutron energy of 14.5 MeV are shown in Fig.11, it can be found that the emission neutrons mainly come from the (n, el), (n, inl), and (n, 2n) reactions, and the (n, nα) and (n, np) show minor contributions
Summary
The benchmark experimental study on the fusion neutronics plays an important role for validating the accuracy of the evaluated nuclear data, especially the elements that are of interests in nuclear devices, fission and fusion reactors for technologies. A series of experiments on iron[2,3,4,5] have been performed to provide the experimental data base for qualifying and validating the iron nuclear data, by using the D-T neutron source or the 252Cf neutron source. Some discrepancies between measured leakage neutron spectra and MCNP calculated ones with the different evaluated nuclear data libraries have been observed[6]. In order to validate currently available nuclear data files for iron, the leakage neutron spectra from iron slabs were measured and calculated at CIAE by using the integral benchmark facility, which has been successfully used in a series of benchmark experiments [7,8,9,10]. Description of the experimental arrangement, the measurements, the simulations and the results will be given
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