Energy Distribution of Fast Neutron Beam

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Description

Experimental techniques are described for the spectral measurement of a collimated fast neutron beam. A hydrogen filled cloud chamber, proton recording nuclear plates, and threshold fission foils were used as neutron detectors in the measurements. As an application of the above technique, the energy distribution and absolute flux of the fast neutron beam emerging from port 5W of the Los Alamos fast rector has been measured from 0.1 Mev to 18 Mev. The result show a spectral curve possessing a maximum between 9.25 and 0.30 Mev and having an exponential decrease at energies above 1.5 Mev. The mass energy of … continued below

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37 pages: illustrations

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Nereson, Norris G., 1918-2007 February 15, 1951.

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  • Main Title: Energy Distribution of Fast Neutron Beam
  • Added Title: LA (Series) (Los Alamos, N.M.)
  • Series Title: Los Alamos National Laboratory Reports
  • Added Title: Los Alamos National Laboratory Report LA-1234

Description

Experimental techniques are described for the spectral measurement of a collimated fast neutron beam. A hydrogen filled cloud chamber, proton recording nuclear plates, and threshold fission foils were used as neutron detectors in the measurements. As an application of the above technique, the energy distribution and absolute flux of the fast neutron beam emerging from port 5W of the Los Alamos fast rector has been measured from 0.1 Mev to 18 Mev. The result show a spectral curve possessing a maximum between 9.25 and 0.30 Mev and having an exponential decrease at energies above 1.5 Mev. The mass energy of the distribution is at 0.55 Mev and the slope of the exponential section is 3.1 - 0.1 Mev per decade of intensity decrease.

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37 pages: illustrations

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Digitized from microopaque cards (2).

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  • SuDoc Number: Y 3.At 7:22/LA-1234
  • Report No.: LA-1234
  • Accession or Local Control No: metadc1257665
  • Archival Resource Key: ark:/67531/metadc1257665

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  • February 15, 1951

Added to The UNT Digital Library

  • April 12, 2021, 2:51 p.m.

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  • Nov. 16, 2022, 12:53 p.m.

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Nereson, Norris G., 1918-2007. Energy Distribution of Fast Neutron Beam, report, February 15, 1951; Los Alamos, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1257665/: accessed June 20, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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