EPJ Web Conf.
Volume 211, 2019WONDER-2018 – 5th International Workshop On Nuclear Data Evaluation for Reactor applications
|Number of page(s)||9|
|Section||Evaluation of Nuclear Data|
|Published online||05 June 2019|
High-resolution evaluation of the U5(n,f) cross section from 3 keV to 30 keV
1) Universidad de Santiago de Compostela, 15782, Spain
2) EC-JRC-IRMM, Retieseweg 111, B-2440 Geel, Belgium
3) CNRS/IN2P3-Université Paris-Sud- IPN, Orsay
Published online: 5 June 2019
235U neutron-induced fission cross-section is commonly used as reference for determining other isotope fission cross-section. However, below 150 keV this cross section is only included as Standard at the thermal point and recently its integral value between 7.8 eV and 11 eV . The resolved resonance region, spanning up to 2.25 keV, has been reevaluated with high resolution in the last ENDF/B-VIII release  and a SAMMY resonance analysis was done by L. Leal et al.  including the CERN-nTOF experimental work of Paradela el al.  up to 10 keV, taken into account the IAEA Reference file.
In this work the 235U(n,f) low-background and high-resolution experimental data obtained at the CERN-nTOF facility is combined with previous high-resolution experimental data, in order to produce a very fine grid dataset with normalisation to the IAEA Reference file. The extremelyhigh energy calibration required to reproduce the resonance sharp profiles is based on the nTOF DAQ system with a resolution below 0.1% with reference to the 8.78 eV resonance and to the sharp Al(n,g) capture dip at 5.904 keV.
The comparison of the so-evaluated profile with the experimental data and with the evaluated ones will be discussed.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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