@Article{n_TOFCollaborationAmaducci_etal2019,
author="n{\_}TOF Collaboration (Amaducci, S. et al
and Domingo-Pardo, C.
and Tain, J. L.",
title="Measurement of the U-235(n, f) cross section relative to the Li-6(n, t) and B-10(n,alpha) standards from thermal to 170 keV neutron energy range at n{\_}TOF",
journal="European Physical Journal A",
year="2019",
publisher="Springer",
volume="55",
number="7",
pages="120--19pp",
abstract=".The U-235(n, f ) cross section was measured at n{\_}TOF relative to Li-6(n, t) and B-10(n,alpha) , with high resolution ( L=183.49(2) m) and in a wide energy range (25meV-170keV) with 1.5{\%} systematic uncertainty, making use of a stack of six samples and six silicon detectors placed in the neutron beam. This allowed us to make a direct comparison of the yields of the U-235(n, f ) and of the two reference reactions under the same experimental conditions, and taking into account the forward/backward emission asymmetry. A hint of an anomaly in the 10-30keV neutron energy range had been previously observed in other experiments, indicating a cross section systematically lower by several percent relative to major evaluations. The present results indicate that the cross section in the 9-18keV neutron energy range is indeed overestimated by almost 5{\%} in the recently released evaluated data files ENDF/B-VIII.0 and JEFF3.3, as a consequence of a 7{\%} overestimate in a single GMA node in the IAEA reference file. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. The results here reported may lead to a reduction of the uncertainty in the 1-100keV neutron energy region. Finally, from the present data, a value of 249.7 +/- 1.4( stat )+/- 0.94( syst ) b<bold>eV has been extracted for the cross section integral between </bold>7.8 and 11eV, confirming the value of 247.5 +/- 3 b<bold>eV recently established as a standard</bold>.",
optnote="WOS:000477050900001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4083), last updated on Mon, 19 Aug 2019 07:00:41 +0000",
issn="1434-6001",
doi="10.1140/epja/i2019-12802-7",
opturl="https://arxiv.org/abs/1902.10631",
opturl="https://doi.org/10.1140/epja/i2019-12802-7",
language="English"
}