SPECTRUM OF NEUTRONS MODERATED BY HEAVY WATER AT CRYOGENIC TEMPERATURES

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Description

A calculation was made, using the Monte Carlo method, to determine the transmission of neutrons through blocks of deuterium oxide at cryogenic temperatures. Coinputations were made for cylinders of D/sub 2/O ice at four degrees absolute, 60 and 75 centimeters long, and 45 centimeters in diameter. The incident neutrons impinged uniformly over one flat surface with an incident intensity proportional to the cosine of the angle between the direction of motion of the particles and the normal to the surface. Their energy distribution was a Maxwellian at a temperature of 300 deg absolute. In the initial trials of this calculation, ... continued below

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Pages: 30

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Leshan, E.J.; Burr, J.R. & Barbieri, L.J. January 1, 1958.

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Description

A calculation was made, using the Monte Carlo method, to determine the transmission of neutrons through blocks of deuterium oxide at cryogenic temperatures. Coinputations were made for cylinders of D/sub 2/O ice at four degrees absolute, 60 and 75 centimeters long, and 45 centimeters in diameter. The incident neutrons impinged uniformly over one flat surface with an incident intensity proportional to the cosine of the angle between the direction of motion of the particles and the normal to the surface. Their energy distribution was a Maxwellian at a temperature of 300 deg absolute. In the initial trials of this calculation, it was fouad that more than 90% of the incident neutrons were reflected out of the surface of the block at which they had entered. Since in actual use the block will be placed against the thermal column of a reactor, it was clear that the treatment or the incident face as a free surface was not realistic. Such a highly reflecting system would have a marked effect on the flux in the source region, and the material of the thermal column, further, would reflect most of these neutrons back into the D/sub 2/O ice. In order to more adequately represent the physical situation, the program was modified so that neutrons attempting to leak out of this surface were optically reflected back into the system. (auth)

Physical Description

Pages: 30

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  • Other Information: Orig. Receipt Date: 31-DEC-59

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  • Report No.: ASAE-35
  • Grant Number: None
  • DOI: 10.2172/4245962 | External Link
  • Office of Scientific & Technical Information Report Number: 4245962
  • Archival Resource Key: ark:/67531/metadc1025319

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1958

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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Leshan, E.J.; Burr, J.R. & Barbieri, L.J. SPECTRUM OF NEUTRONS MODERATED BY HEAVY WATER AT CRYOGENIC TEMPERATURES, report, January 1, 1958; Country unknown/Code not available. (digital.library.unt.edu/ark:/67531/metadc1025319/: accessed January 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.