Cross section data are fundamental quantities which affect the accuracy of all calculations in nuclear applications. A new dosimetry library IRDFF-II that contains cross section evaluations with full uncertainty quantification was developed by the International Atomic Energy Agency and released in January 2020 (https://www-nds.iea.org/IRDFF). A previous version, IRDFF-1.05, was released in 2014 and experimental validation of the newly released cross section by spectrum averaged cross section (SACS) measurements is a high priority task. For such purpose, a neutron dosimeter set containing 5 target foils was activated in 2 independent experiments at the VR-1 reactor of the Czech Technical University in Prague. Care was taken to derive SACS with low uncertainties. New experimental evaluation method is in good agreement with previous approaches based on relative measurements using monitor foils. Good agreement of measured SACS and evaluated IRDFF-II cross sections is observed. Slight overestimation of evaluated ENDF/B-VIII.0 235U(nth,f) PFNS above 10 MeV is discussed.
@article{arxiv.2306.09921,
title = {Validation of IRDFF-II library in VR-1 reactor field using thin targets},
author = {Michal Kostal and Evzen Losa1 and Martin Schulc and Jan Simon and Tomas Bily and Vojtech Rypar and Martin Mareček and Jan Uhlíř and Tomáš Czakoj and Roberto Capote and Andrej Trkov and Stanislav Simakov},
journal= {arXiv preprint arXiv:2306.09921},
year = {2023}
}