Neutron transfer kernels in the resonance domain in the harmonic crystal model.

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To describe neutron scattering the resonance domain of the nuclear fuel isotopes, the static model is widely in use in nuclear data processing codes. With this model the influence of chemical binding on the transfer cross section is not taken into account since the nucleus is considered to be in rest and isolated in the laboratory system. Further, the application of the free gas model to the resonant scattering of neutrons shows that the up-scattering probability is strongly dependent on the incident neutron energy. If the latter is smaller than the resonance energy then the free gas model predicts an ... continued below

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7 p.

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Naberejnev, D. G. December 21, 1999.

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Description

To describe neutron scattering the resonance domain of the nuclear fuel isotopes, the static model is widely in use in nuclear data processing codes. With this model the influence of chemical binding on the transfer cross section is not taken into account since the nucleus is considered to be in rest and isolated in the laboratory system. Further, the application of the free gas model to the resonant scattering of neutrons shows that the up-scattering probability is strongly dependent on the incident neutron energy. If the latter is smaller than the resonance energy then the free gas model predicts an enormous chance for the neutron to gain energy after collision. Neither the static nor free gas model is adequate to describe the resonant scattering of neutrons in a crystal. This fact can induce non-negligible errors in reactor calculations and, in particular, in the estimation of the Doppler coefficient. In the present paper the author proposes the theoretical study of the possibility to estimate the neutron transfer cross sections in the harmonic crystal approximation.

Physical Description

7 p.

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INIS; OSTI as DE00750497

Medium: P; Size: 7 pages

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  • 2000 ANS International Topical Meeting on Advances in Reactor Physics and Mathematics and Computation into the Next Millennium, Pittsburgh, PA (US), 05/07/2000--05/11/2000

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  • Report No.: ANL/TD/CP-99972
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750497
  • Archival Resource Key: ark:/67531/metadc707897

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  • December 21, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 11, 2017, 3:16 p.m.

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Naberejnev, D. G. Neutron transfer kernels in the resonance domain in the harmonic crystal model., article, December 21, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc707897/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.