INDEN Nuclear Data Update on U-235, Pu-239, U-233 Covariance
Collaboration led by Roberto Capote from IAEA presents updates on nubar covariance for U-235, Pu-239, and U-233. Includes reintroduction of nubar fluctuations, missed experiment details, and reductions in uncertainties for fissile materials in the energy range 20eV-50keV. The advancements aim to enhance data accuracy and reliability in nuclear reactions research.
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INDEN (nubar) covariance update U-235, Pu-239, U-233 R. Capote (IAEA) on behalf of the INDEN collaboration https://www-nds.iaea.org/INDEN Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 1 CSWEG (video conference) November 2021, BNL, Brookhaven, NY, USA R.CapoteNoy@iaea.org http://www-nds.iaea.org
nubar fluctuations for resonances: reintroduced in ENDF/B-VIII.0 for n+235U U-235 nubar Pu-239 nubar G. Noguere, INDEN CM 2018 M. Pigni, INDEN CM 2018 Fluctuations will be added for all major fissiles Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 2 CSWEG (video conference) November 2021, BNL, Brookhaven, NY, USA R.CapoteNoy@iaea.org http://www-nds.iaea.org
Missed experiment by Gwin et al (1986) in 235U ENDF/B-VIII.0 nubar 500 eV-10 MeV Data for U-233, U-235, Pu-239 with uncertainties !! Relative to Cf-252 prompt (TNC) Fissile nubar uncert. ~ 0.5% 500eV - 100keV For all fissiles Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 3 CSWEG (video conference) November 2021, BNL, Brookhaven, NY, USA R.CapoteNoy@iaea.org http://www-nds.iaea.org
Uncertainties reduced from 2% down to 0.5% in range 20eV-50keV (U-235, Pu-239, U-233) nubar 0.1 1 10 100 Incident energy (keV) Roberto Capote, IAEA Nuclear Data Section e-mail: R.CapoteNoy@iaea.org Web: http://www-nds.iaea.org 4 CSWEG (video conference) November 2021, BNL, Brookhaven, NY, USA R.CapoteNoy@iaea.org http://www-nds.iaea.org
