Title:
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High-resolution study of 237 Np fission cross section from 5 eV to 1 MeV
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Author:
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Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Poch Parés, Agustí; Pretel Sánchez, Carme
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions |
Abstract:
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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. |
Subject(s):
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-Àrees temàtiques de la UPC::Física -Neutrons -Neutrons |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Conference Object |
Published by:
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Robert C.Haight; Mark B. Chadwick; Toshihiko Kawano; Patrick Talou
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