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Abstract
The neutron transmission experiments are one of the main sources of information about the neutron cross section resonance structure and effect in the self-shielding. Such kind of data for niobium and silicon nuclides in energy range 7 keV to 3 MeV can be obtained from low-resolution transmission measurements performed earlier in Russia (with samples of 0.027 to 0.871 atom/barn for niobium and 0.076 to 1.803 atom/barn for silicon). A significant calculation-to-experiment discrepancy in energy range 100 to 600 keV and 300 to 800 keV for niobium and silicon, respectively, obtained using the evaluated nuclear data library ROSFOND, were found. The EVPAR code was used for estimation the average resonance parameters in energy range 7 to 600 keV for niobium. For silicon a stochastic optimization method was used to modify the resolved resonance parameters in energy range 300 to 800 keV. The improved ROSFOND evaluated nuclear data files were tested in calculation of ICSBEP integral benchmark experiments.
Highlights
Improvement of Russian national library of evaluated nuclear data files ROSFOND [1] is an actual task for increasing the calculation precision
Testing of the niobium and silicon neutron data in the resonance energy region can be made with help of neutron transmission measurements [3] made through a wide range of thicknesses of samples
The obtained new resonance data for the niobium and silicon were tested through calculations of ICSBEP Handbook integral benchmark experiments: one for niobium (HEU-MET-FAST-047) and two for silicon (HEU-MET-MIXED-005 and PU-MET-MIXED-001)
Summary
Improvement of Russian national library of evaluated nuclear data files ROSFOND [1] is an actual task for increasing the calculation precision. The second task is definition of the p-resonance within the energy close to 700 keV viewed in the JEF-2.2 (Fig. 1) but which is not included in new versions of any data libraries. Testing of the niobium and silicon neutron data in the resonance energy region can be made with help of neutron transmission measurements [3] made through a wide range of thicknesses of samples. The neutron transmission experiments in energy range 1 keV to 3 MeV have been conducted in 1960s for a wide list of reactor materials ( [3]), such as Fe, Ni, Cr, Si, Nb, Be, Cu, Zr, Mo, W, Pb, Bi, Al, Zn, V, Ti, C, Mg, P, S, Ga, Sb, Ba, Ta. Transmission experimental data with samples of iron, chromium, and nickel were assessed and included in the ICSBEP Handbook [4] (as FUND-IPPE-VdG-MULTTRANS-001). Measurements were performed in the energy interval from 1 keV to 3 MeV
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