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Resolved resonance region evaluations of n+ 206,207,208Pb for fast spectrum applications.

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Title: Resolved resonance region evaluations of n+ 206,207,208Pb for fast spectrum applications.
Authors: Brain, Peter1 (AUTHOR) brain@lanl.gov, Danon, Yaron1 (AUTHOR), Brown, Dave2 (AUTHOR), Barry, Devin3 (AUTHOR), Lewis, Amanda3 (AUTHOR), Trumbull, Tim3 (AUTHOR), Kawano, Toshihiko4 (AUTHOR)
Source: Annals of Nuclear Energy. Jul2024, Vol. 202, pN.PAG-N.PAG. 1p.
Subjects: Elastic scattering, Resonance, Lead isotopes, Fast reactors, Angular distribution (Nuclear physics), Sensitivity analysis
Abstract: Resolved resonance region evaluations of the major isotopes of natural lead, 206Pb, 207Pb, 208Pb, have been performed to support the development of Generation IV reactors. Validation of nuclear data for lead fast reactors was performed with simulations of shielding benchmarks, integral critical benchmarks, and quasi-differential scattering measurements. Sensitivity analyses of these systems showed that elastic scattering reactions above 100 keV were the dominant reactions driving system performance. The resolved resonance regions (RRRs) of the lead isotopes extend past 100 keV, making the RRR an ideal starting point to evaluate lead cross sections. Since the R-matrix requires knowledge of bound, distant, and observed resonances, it was necessary to evaluate from 1 0 − 5 eV up to the respective limit of the RRR. The 208Pb RRR evaluation was extended to 1.5 MeV in order to obtain resonance parameters used to calculate new elastic scattering angular distributions up to 1.5 MeV. Resonance parameter uncertainties and covariance were generated using the R-matrix code SAMMY. The new RRR parameters show a direct improvement to the scattering kernel below 1.5 MeV which in turn greatly improves fast critical experiments over ENDF/B-VIII.0. [ABSTRACT FROM AUTHOR]
Copyright of Annals of Nuclear Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 176406465
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PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Resolved resonance region evaluations of n+ 206,207,208Pb for fast spectrum applications.
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  Data: <searchLink fieldCode="AR" term="%22Brain%2C+Peter%22">Brain, Peter</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> brain@lanl.gov</i><br /><searchLink fieldCode="AR" term="%22Danon%2C+Yaron%22">Danon, Yaron</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Brown%2C+Dave%22">Brown, Dave</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Barry%2C+Devin%22">Barry, Devin</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lewis%2C+Amanda%22">Lewis, Amanda</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Trumbull%2C+Tim%22">Trumbull, Tim</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kawano%2C+Toshihiko%22">Kawano, Toshihiko</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Annals+of+Nuclear+Energy%22">Annals of Nuclear Energy</searchLink>. Jul2024, Vol. 202, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Elastic+scattering%22">Elastic scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Resonance%22">Resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Lead+isotopes%22">Lead isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Fast+reactors%22">Fast reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Angular+distribution+%28Nuclear+physics%29%22">Angular distribution (Nuclear physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Sensitivity+analysis%22">Sensitivity analysis</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Resolved resonance region evaluations of the major isotopes of natural lead, 206Pb, 207Pb, 208Pb, have been performed to support the development of Generation IV reactors. Validation of nuclear data for lead fast reactors was performed with simulations of shielding benchmarks, integral critical benchmarks, and quasi-differential scattering measurements. Sensitivity analyses of these systems showed that elastic scattering reactions above 100 keV were the dominant reactions driving system performance. The resolved resonance regions (RRRs) of the lead isotopes extend past 100 keV, making the RRR an ideal starting point to evaluate lead cross sections. Since the R-matrix requires knowledge of bound, distant, and observed resonances, it was necessary to evaluate from 1 0 − 5 eV up to the respective limit of the RRR. The 208Pb RRR evaluation was extended to 1.5 MeV in order to obtain resonance parameters used to calculate new elastic scattering angular distributions up to 1.5 MeV. Resonance parameter uncertainties and covariance were generated using the R-matrix code SAMMY. The new RRR parameters show a direct improvement to the scattering kernel below 1.5 MeV which in turn greatly improves fast critical experiments over ENDF/B-VIII.0. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Annals of Nuclear Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1016/j.anucene.2024.110452
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        Text: English
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      – SubjectFull: Elastic scattering
        Type: general
      – SubjectFull: Resonance
        Type: general
      – SubjectFull: Lead isotopes
        Type: general
      – SubjectFull: Fast reactors
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      – SubjectFull: Angular distribution (Nuclear physics)
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      – SubjectFull: Sensitivity analysis
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      – TitleFull: Resolved resonance region evaluations of n+ 206,207,208Pb for fast spectrum applications.
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              Text: Jul2024
              Type: published
              Y: 2024
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