Measurement of the fast neutron capture cross section of /sup 238/U relative to /sup 235/U(n,f)

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The capture cross section of /sup 238/U was measured using the activation technique and /sup 235/U(n,f) as a reference cross section. Capture events were measured by detection of two prominent ..gamma..-transitions in the decay of the /sup 239/U daughter nuclide, /sup 239/Np, employing a high resolution Ge(Li) detector. The system was calibrated with samples activated in a thermal neutron flux relative to the capture cross section of gold, and with an absolutely calibrated ..cap alpha..-emitter, /sup 243/Am, which decays to /sup 239/Np. Cross section measurements were carried out in the neutron energy range from 30 keV to 3 MeV. Emphasis ... continued below

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Pages: 7

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Fawcett, L.R. Jr.; Poenitz, W.P. & Smith, D.L. January 1, 1979.

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The capture cross section of /sup 238/U was measured using the activation technique and /sup 235/U(n,f) as a reference cross section. Capture events were measured by detection of two prominent ..gamma..-transitions in the decay of the /sup 239/U daughter nuclide, /sup 239/Np, employing a high resolution Ge(Li) detector. The system was calibrated with samples activated in a thermal neutron flux relative to the capture cross section of gold, and with an absolutely calibrated ..cap alpha..-emitter, /sup 243/Am, which decays to /sup 239/Np. Cross section measurements were carried out in the neutron energy range from 30 keV to 3 MeV. Emphasis was on absolute values between 150 keV and 1 MeV where the /sup 238/U(n,..gamma..) cross section and its cross section is small. Background from fission products was found to restrict the accuracy of the measured data at energies > 1.5 MeV.

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Pages: 7

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02

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  • International conference on nuclear cross sections for technology, Knoxville, TN, USA, 22 Oct 1979

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  • Report No.: CONF-791058-65
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 5788950
  • Archival Resource Key: ark:/67531/metadc1099443

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1979

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  • Feb. 18, 2018, 3:59 p.m.

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  • April 19, 2018, 2:31 p.m.

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Fawcett, L.R. Jr.; Poenitz, W.P. & Smith, D.L. Measurement of the fast neutron capture cross section of /sup 238/U relative to /sup 235/U(n,f), article, January 1, 1979; Illinois. (digital.library.unt.edu/ark:/67531/metadc1099443/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.