Ponencia
High-resolution study of Np-237 fission cross section from 5 eV to 1 MeV
Autor/es | Furman, W.
Cennini, P. Ketlerov, V. Capote del Villar, Ramón Lozano Leyva, Manuel Luis Quesada Molina, José Manuel Wisshak, K. |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2005 |
Fecha de depósito | 2020-07-27 |
Publicado en |
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ISBN/ISSN | 0094-243X (impreso) 1551-7616 (electrónico) |
Resumen | A series of measurements of 237Np fission cross section have been performed at the CERN spallation neutron facility n_TOF which covers a wide energy range from 1 eV up to 250 MeV. A fast ionization chamber (FIC) was used ... A series of measurements of 237Np fission cross section have been performed at the CERN spallation neutron facility n_TOF which covers a wide energy range from 1 eV up to 250 MeV. A fast ionization chamber (FIC) was used as a fission fragment detector with registration efficiency of not less than 97 %. Particular attention was paid to correct the fission cross section with use of 235U standard. Total experimental uncertainties are determined to be at the level of 3%. Analysis of the experimental data in the restricted neutron energy from 5 eV up to 1 MeV showed a systematic deviation from evaluated data (ENDF/B-VI). This discrepancy amounts to up to a factor 3 for resolved resonances in the neutron energy range of 5 eV - 2 KeV, and is in good agreement with some previous experiments. A similar disagreement at the level of 6-7% was found for higher energies around the threshold (En = 300 keV-1 MeV). This energy range is essential for the transmutation of neptunium in ADS or fast reactors. It is concluded that an updated evaluation of nuclear data for 237Np is required. |
Cita | Furman, W., Cennini, P., Ketlerov, V., Capote del Villar, R., Lozano Leyva, M.L., Quesada Molina, J.M. y Wisshak, K. (2005). High-resolution study of Np-237 fission cross section from 5 eV to 1 MeV. En International Conference on Nuclear Data for Science and Technology (1039-1042), Santa Fe, (Nuevo México): AIP Publishing. |
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