Modeling of High Precision Neutron Nonelastic Cross Sections

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A new method has been applied to the determination of neutron nonelastic cross sections for iron {sup 56}Fe and lead {sup 208}Pb for energies between 5 and 26 MeV. These data have estimated errors of only a few percent and do not suffer from the ambiguities encountered in earlier nonelastic data. We attempt to fit these high precision data using both a semiclassical single phase shift model (nuclear Ramsauer model) as well as a recent global optical model that well reproduces a wide body of neutron scattering observables. At the 5% uncertainty level, both models produce satisfactory fits. However, neither ... continued below

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Dietrich, F S; Anderson, J D; Bauer, R W; Grimes, S M & McNabb, D P February 5, 2007.

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A new method has been applied to the determination of neutron nonelastic cross sections for iron {sup 56}Fe and lead {sup 208}Pb for energies between 5 and 26 MeV. These data have estimated errors of only a few percent and do not suffer from the ambiguities encountered in earlier nonelastic data. We attempt to fit these high precision data using both a semiclassical single phase shift model (nuclear Ramsauer model) as well as a recent global optical model that well reproduces a wide body of neutron scattering observables. At the 5% uncertainty level, both models produce satisfactory fits. However, neither model gives satisfactory fits to these new precise data. We conclude that fitting precise data, i.e., data with errors of approximately 2% or less, may require a nuclear mass dependence of radii that reflects structure effects such as shell closures.

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PDF-file: 25 pages; size: 0.2 Mbytes

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  • Journal Name: Nuclear Science and Engineering, vol. 159, no. 2, June 1, 2008, pp. 213-220; Journal Volume: 159; Journal Issue: 2

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  • Report No.: UCRL-JRNL-227831
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 940491
  • Archival Resource Key: ark:/67531/metadc902663

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 5, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 5:56 p.m.

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Dietrich, F S; Anderson, J D; Bauer, R W; Grimes, S M & McNabb, D P. Modeling of High Precision Neutron Nonelastic Cross Sections, article, February 5, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc902663/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.