Abstract
The 235 U neutron-induced cross section is widely used as reference cross section for measuring other fission cross sections, but in the resonance region it is not considered as an IAEA standard because of the scarce experimental data covering the full region. In this work, we deal with a new analysis of the experimental data obtained with a detection setup based on parallel plate ionization chambers (PPACs) at the CERN n_TOF facility in the range from 1 eV to 10 keV. The relative cross section has been normalised to the IAEA value in the region between 7.8 and 11 eV, which is claimed as well-known. Comparison with the ENDF/B-VII evaluation and the IAEA reference file from 100 eV to 10 keV are provided.
Highlights
The 235U neutron-induced fission cross-section is of greatest importance for reactor physics, and has been extensively studied since the earliest nuclear research
The 235U neutron-induced cross section is widely used as reference cross section for measuring other fission cross sections, but in the resonance region it is not considered as an IAEA standard because of the scarce experimental data covering the full region
These data are compared to the ENDF/B-VII evaluated dataset and to the integral values given by the IAEA reference file
Summary
The 235U neutron-induced fission cross-section is of greatest importance for reactor physics, and has been extensively studied since the earliest nuclear research. It has become one of the main references for neutron-induced measurements, being used in a large number of applications involving neutron dosimetry or monitoring. We report on an improved release of the fission cross section in the range between 1 eV and 10 keV, where the n_TOF flux shape is smooth and very well known These data are compared to the ENDF/B-VII evaluated dataset and to the integral values given by the IAEA reference file
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