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Title: IAEA CIELO Evaluation of Neutron-induced Reactions on 235U and 238U Targets

Abstract

Evaluations of nuclear reaction data for the major uranium isotopes 238U and 235U were performed within the scope of the CIELO Project on the initiative of the OECD/NEA Data Bank under Working Party on Evaluation Co-operation (WPEC) Subgroup 40 coordinated by the IAEA Nuclear Data Section. Both the mean values and covariances are evaluated from 10 -5 eV up to 30 MeV. The resonance parameters of 238U and 235U were re-evaluated with the addition of newly available data to the existing experimental database. The evaluations in the fast neutron range are based on nuclear model calculations with the code EMPIRE–3.2 Malta above the resonance range up to 30 MeV. 235U(n,f), 238U(n,f), and 238U(n,γ) cross sections and 235U(n th,f) prompt fission neutron spectrum (PFNS) were evaluated within the Neutron Standards project and are representative of the experimental state-of-the-art measurements. The Standards cross sections were matched in model calculations as closely as possible to guarantee a good predictive power for cross sections of competing neutron scattering channels. 235U(n,γ) cross section includes fluctuations observed in recent experiments. 235U(n,f) PFNS for incident neutron energies from 500 keV to 20 MeV were measured at Los Alamos Chi-Nu facility and re-evaluated using all available experimental data.more » While respecting the measured differential data, several compensating errors in previous evaluations were identified and removed so that the performance in integral benchmarks was restored or improved. Covariance matrices for 235U and 238U cross sections, angular distributions, spectra and neutron multiplicities were evaluated using the GANDR system that combines experimental data with model uncertainties. Unrecognized systematic uncertainties were considered in the uncertainty quantification for fission and capture cross sections above the thermal range, and for neutron multiplicities. Evaluated files were extensively benchmarked to ensure good performance in reactor calculations and fusion-related systems. New comprehensive evaluations show excellent agreement with available differential data and integral performance better than current evaluated data libraries, and represent a step forward in a quest for better nuclear data for applications.« less

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [5];  [7];  [7];  [8];  [9];  [10];  [11];  [5];  [10];  [12];  [6];  [11];  [13] more »;  [14];  [10];  [10] « less
  1. International Atomic Energy Agency, Vienna (Austria)
  2. University of Bucharest (Romania)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. PI Atomstandart at SC Rosatom, Moscow (Russia)
  5. CIEMAT, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Madrid (Spain)
  6. CEA, DEN, DER, SPRC, Cadarache (France)
  7. Rensselaer Polytechnic Institute, Troy, NY (United States)
  8. Josef Stefan Institute (Slovenia)
  9. Brookhaven National Lab. (BNL), Upton, NY (United States)
  10. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  11. EC-JRC (Belgium)
  12. IRSN/PSN-EXP/SNC/LNR, Institut de Radioprotection et de Surete Nucleaire, Cedex (France)
  13. Institute for Nuclear Research and Nuclear Energy, BAS (Bulgaria)
  14. Joint Institute for Energy and Nuclear Research, Minsk (Belarus)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1438427
Alternate Identifier(s):
OSTI ID: 1427383; OSTI ID: 1462854
Report Number(s):
LA-UR-17-30805; BNL-203651-2018-JAAM
Journal ID: ISSN 0090-3752; TRN: US1802588
Grant/Contract Number:  
AC52-06NA25396; SC0012704; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Data Sheets
Additional Journal Information:
Journal Volume: 148; Journal Issue: C; Journal ID: ISSN 0090-3752
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Capote, R., Trkov, A., Sin, M., Pigni, M. T., Pronyaev, V. G., Balibrea, J., Bernard, D., Cano-Ott, D., Danon, Y., Daskalakis, A., Goričanec, T., Herman, M. W., Kiedrowski, B., Kopecky, S., Mendoza, E., Neudecker, D., Leal, L., Noguere, G., Schillebeeckx, P., Sirakov, I., Soukhovitskii, E. S., Stetcu, I., and Talou, P. IAEA CIELO Evaluation of Neutron-induced Reactions on 235U and 238U Targets. United States: N. p., 2018. Web. doi:10.1016/j.nds.2018.02.005.
Capote, R., Trkov, A., Sin, M., Pigni, M. T., Pronyaev, V. G., Balibrea, J., Bernard, D., Cano-Ott, D., Danon, Y., Daskalakis, A., Goričanec, T., Herman, M. W., Kiedrowski, B., Kopecky, S., Mendoza, E., Neudecker, D., Leal, L., Noguere, G., Schillebeeckx, P., Sirakov, I., Soukhovitskii, E. S., Stetcu, I., & Talou, P. IAEA CIELO Evaluation of Neutron-induced Reactions on 235U and 238U Targets. United States. doi:10.1016/j.nds.2018.02.005.
Capote, R., Trkov, A., Sin, M., Pigni, M. T., Pronyaev, V. G., Balibrea, J., Bernard, D., Cano-Ott, D., Danon, Y., Daskalakis, A., Goričanec, T., Herman, M. W., Kiedrowski, B., Kopecky, S., Mendoza, E., Neudecker, D., Leal, L., Noguere, G., Schillebeeckx, P., Sirakov, I., Soukhovitskii, E. S., Stetcu, I., and Talou, P. Thu . "IAEA CIELO Evaluation of Neutron-induced Reactions on 235U and 238U Targets". United States. doi:10.1016/j.nds.2018.02.005. https://www.osti.gov/servlets/purl/1438427.
@article{osti_1438427,
title = {IAEA CIELO Evaluation of Neutron-induced Reactions on 235U and 238U Targets},
author = {Capote, R. and Trkov, A. and Sin, M. and Pigni, M. T. and Pronyaev, V. G. and Balibrea, J. and Bernard, D. and Cano-Ott, D. and Danon, Y. and Daskalakis, A. and Goričanec, T. and Herman, M. W. and Kiedrowski, B. and Kopecky, S. and Mendoza, E. and Neudecker, D. and Leal, L. and Noguere, G. and Schillebeeckx, P. and Sirakov, I. and Soukhovitskii, E. S. and Stetcu, I. and Talou, P.},
abstractNote = {Evaluations of nuclear reaction data for the major uranium isotopes 238U and 235U were performed within the scope of the CIELO Project on the initiative of the OECD/NEA Data Bank under Working Party on Evaluation Co-operation (WPEC) Subgroup 40 coordinated by the IAEA Nuclear Data Section. Both the mean values and covariances are evaluated from 10-5 eV up to 30 MeV. The resonance parameters of 238U and 235U were re-evaluated with the addition of newly available data to the existing experimental database. The evaluations in the fast neutron range are based on nuclear model calculations with the code EMPIRE–3.2 Malta above the resonance range up to 30 MeV. 235U(n,f), 238U(n,f), and 238U(n,γ) cross sections and 235U(nth,f) prompt fission neutron spectrum (PFNS) were evaluated within the Neutron Standards project and are representative of the experimental state-of-the-art measurements. The Standards cross sections were matched in model calculations as closely as possible to guarantee a good predictive power for cross sections of competing neutron scattering channels. 235U(n,γ) cross section includes fluctuations observed in recent experiments. 235U(n,f) PFNS for incident neutron energies from 500 keV to 20 MeV were measured at Los Alamos Chi-Nu facility and re-evaluated using all available experimental data. While respecting the measured differential data, several compensating errors in previous evaluations were identified and removed so that the performance in integral benchmarks was restored or improved. Covariance matrices for 235U and 238U cross sections, angular distributions, spectra and neutron multiplicities were evaluated using the GANDR system that combines experimental data with model uncertainties. Unrecognized systematic uncertainties were considered in the uncertainty quantification for fission and capture cross sections above the thermal range, and for neutron multiplicities. Evaluated files were extensively benchmarked to ensure good performance in reactor calculations and fusion-related systems. New comprehensive evaluations show excellent agreement with available differential data and integral performance better than current evaluated data libraries, and represent a step forward in a quest for better nuclear data for applications.},
doi = {10.1016/j.nds.2018.02.005},
journal = {Nuclear Data Sheets},
number = C,
volume = 148,
place = {United States},
year = {2018},
month = {2}
}

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