Water Spectra and Energy Exchange Kernels

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Many measurement of neutron spectra have been made in water assemblies. In these system a large part of the spectrum is given by an essentially Maxwellian distribution at the moderator temperature which is insensitive to the scattering model. Hence, the test of the energy exchange scattering kernel is in the difference of the spectrum and the fundamental or Maxwellian component. The figure shows the spectrum for the Nelkin model. Once the fundamental has been subtracted neither theoretical model seems to fit the data extremely well. Below kT the Nelkin model is a closer fit than the gas model but it … continued below

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4 pages : illustrations.

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Daitch, Paul B. (Paul Bernard), 1925- & Ohanian, M. J. July 11, 1963.

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Description

Many measurement of neutron spectra have been made in water assemblies. In these system a large part of the spectrum is given by an essentially Maxwellian distribution at the moderator temperature which is insensitive to the scattering model. Hence, the test of the energy exchange scattering kernel is in the difference of the spectrum and the fundamental or Maxwellian component. The figure shows the spectrum for the Nelkin model. Once the fundamental has been subtracted neither theoretical model seems to fit the data extremely well. Below kT the Nelkin model is a closer fit than the gas model but it underestimates the deviation from the Maxwellian whereas in the joining region it overestimates the distortion.

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4 pages : illustrations.

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Digitized from microopaque cards.

Includes bibliographical references (page 3).

To be presented at the American Nuclear Society Meeting, New York, New York, November 18-21, 1963.

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  • Report No.: CONF-187-113
  • SuDoc Number: Y 3.At 7:22/CONF-187-113
  • Accession or Local Control No: metadc1201741
  • Archival Resource Key: ark:/67531/metadc1201741

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Technical Report Archive and Image Library

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  • July 11, 1963

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  • Aug. 27, 2019, 3:53 p.m.

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  • April 1, 2020, 4:06 p.m.

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Daitch, Paul B. (Paul Bernard), 1925- & Ohanian, M. J. Water Spectra and Energy Exchange Kernels, report, July 11, 1963; Oak Ridge, Tennessee.. (https://digital.library.unt.edu/ark:/67531/metadc1201741/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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