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dc.contributor.authorn TOF Collaboration
dc.date.accessioned2021-01-16T00:10:46Z
dc.date.available2021-01-16T00:10:46Z
dc.date.issued2020-10-20
dc.identifier.citationn TOF Collaboration 2020 , ' Measurement of the α ratio and (n,γ) cross section of U 235 from 0.2 to 200 eV at n_TOF MEASUREMENT of the α RATIO and ... J. BALIBREA-CORREA et al. ' , Physical Review C (nuclear physics) , vol. 102 , no. 4 , 044615 . https://doi.org/10.1103/PhysRevC.102.044615
dc.identifier.issn2469-9985
dc.identifier.urihttp://hdl.handle.net/2299/23687
dc.description© 2020 the Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
dc.description.abstractWe measured the neutron capture-to-fission cross-section ratio (α ratio) and the capture cross section of U235 between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF2 Total Absorption Calorimeter (TAC), used for detection of γ rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the Li6(n,t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the U235(n,f) cross section between 7.8 and 11 eV was then used for its absolute normalization. The α ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of U235 performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV.en
dc.format.extent18
dc.format.extent2703808
dc.language.isoeng
dc.relation.ispartofPhysical Review C (nuclear physics)
dc.subjectNuclear and High Energy Physics
dc.titleMeasurement of the α ratio and (n,γ) cross section of U 235 from 0.2 to 200 eV at n_TOF MEASUREMENT of the α RATIO and ... J. BALIBREA-CORREA et al.en
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85095131388&partnerID=8YFLogxK
rioxxterms.versionofrecord10.1103/PhysRevC.102.044615
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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