Problems and progress regarding resonance parameterization of /sup 235/U and /sup 239/Pu for ENDF/B

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The procedures used to obtain the resolved and unresolved resonance parameterization of /sup 235/U and /sup 239/Pu contained in the US Evaluated Nuclear Data File ENDF/B-V are reviewed. For /sup 235/U, recommendations are made to improve the representation by including information on resonance spins and fission-channel vector orientations, and some preliminary results are presented. Evidence is reviewed that it is the fission channels rather than the spins of the resonances that lead to differences in fission mass distributions, the number of neutrons emitted per fission, and fission kinetic energies. The improved parameterization may thus have physics content that will prove ... continued below

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Pages: 20

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Moore, M.S.; de Saussure, G. & Smith, J.R. January 1, 1981.

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The procedures used to obtain the resolved and unresolved resonance parameterization of /sup 235/U and /sup 239/Pu contained in the US Evaluated Nuclear Data File ENDF/B-V are reviewed. For /sup 235/U, recommendations are made to improve the representation by including information on resonance spins and fission-channel vector orientations, and some preliminary results are presented. Evidence is reviewed that it is the fission channels rather than the spins of the resonances that lead to differences in fission mass distributions, the number of neutrons emitted per fission, and fission kinetic energies. The improved parameterization may thus have physics content that will prove of interest in future applications.

Physical Description

Pages: 20

Notes

NTIS, PC A02/MF A01.

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  • Joint IAEA/NEA consultants meeting on uranium and plutonium resonance parameters, Vienna, Austria, 28 Sep 1981

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  • Other: DE82000591
  • Report No.: LA-UR-81-2650
  • Report No.: CONF-810957-2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5971444
  • Archival Resource Key: ark:/67531/metadc1098916

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  • January 1, 1981

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  • Feb. 18, 2018, 3:59 p.m.

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  • March 27, 2018, 7:07 p.m.

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Moore, M.S.; de Saussure, G. & Smith, J.R. Problems and progress regarding resonance parameterization of /sup 235/U and /sup 239/Pu for ENDF/B, article, January 1, 1981; United States. (digital.library.unt.edu/ark:/67531/metadc1098916/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.