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Measurement of the a ratio and (n,¿) cross section of U 235 from 0.2 to 200 eV at n_TOF

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10.1103/PhysRevC.102.044615
 
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hdl:2117/336700

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Balibrea-Correa, J.
Mendoza, E.
Cano Ott, Daniel
Capote Noy, Roberto
Altstadt, Sebastian
Andrzejewski, Józef
Audouin, Ludmila
Bécares, Vicente
Barbagallo, Massimo
Becvar, F.
Belloni, Fabio
Berthoumieux, Eric
Billowes, J.
Calviño Tavares, FranciscoMés informacióMés informacióMés informació
Cortés Rossell, Guillem PereMés informacióMés informacióMés informació
Gómez Hornillos, María Belén
Document typeArticle
Defense date2020-10-20
PublisherAmerican Physical Society
Rights accessOpen Access
Attribution 4.0 International
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution 4.0 International
Abstract
We measured the neutron capture-to-fission cross-section ratio (a ratio) and the capture cross section of 235U 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 ¿ 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 6 Li(n,t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the 235U(n, f ) cross section between 7.8 and 11 eV was then used for its absolute normalization. The a 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 235U 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
CitationBalibrea-Correa, J. [et al.]. Measurement of the a ratio and (n,¿) cross section of U 235 from 0.2 to 200 eV at n_TOF. "Physical review C", 20 Octubre 2020, vol. 102, núm. 4, p. 044615:1-044615:18. 
URIhttp://hdl.handle.net/2117/336700
DOI10.1103/PhysRevC.102.044615
ISSN2469-9993
Publisher versionhttps://journals.aps.org/prc/abstract/10.1103/PhysRevC.102.044615
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  • ANT - Advanced Nuclear Technologies Research Group - Articles de revista [180]
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