Artículo
Measurement of the α ratio and (n, γ) cross section of 235U from 0.2 to 200 eV at n_TOF
Autor/es | Balibrea Correa, J.
Mendoza, E. Cano Ott, D. González, E. Capote, R. Krticka, M. Cortés Giraldo, Miguel Antonio ![]() ![]() ![]() ![]() ![]() ![]() ![]() Lerendegui Marco, Jorge Praena Rodríguez, Javier Quesada Molina, José Manuel ![]() ![]() ![]() ![]() ![]() ![]() ![]() Sabaté Gilarte, Marta Žugec, P. |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2020 |
Fecha de depósito | 2022-02-14 |
Publicado en |
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Resumen | We measured the neutron capture-to-fission cross-section ratio (α 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 ... We measured the neutron capture-to-fission cross-section ratio (α 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 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 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 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 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. |
Agencias financiadoras | Ministerio de Economía. España European Union (UE) FPA2017-82647-P |
Identificador del proyecto | FPA2014-53290-C2-1
![]() FPA2016-76765- P ![]() CHANDA FP7-605203 ![]() |
Cita | Balibrea Correa, J., Mendoza, E., Cano Ott, D., González, E., Capote, R., Krticka, M.,...,Žugec, P. (2020). Measurement of the α ratio and (n, γ) cross section of 235U from 0.2 to 200 eV at n_TOF. Physical Review C, 102, 044615. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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PhysRevC.102.044615.pdf | 2.578Mb | ![]() | Ver/ | |