A PULSED NEUTRON SOURCE TECHNIQUE

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For a measurement of the diffusion constant D from the decay of the fundamental mode only, optimal dimensions of the pile are given, leading to a fast decay of the higher modes. Another method is discussed which makes use also of higher modes. Evaluation formulas and optimal pile dimensions for this method are derived. The amplitudes of the normal modes are calculated for different initial distributions of the neutrons by means of the Fermi age theory. The error introduced using Fermi age theory was fixed moderator atoms for the slowing down process down to thermal energy is estimated. In one ... continued below

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Pages: 32

Creation Information

Siems, R. & Melissaropoulos, M. November 1, 1960.

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Description

For a measurement of the diffusion constant D from the decay of the fundamental mode only, optimal dimensions of the pile are given, leading to a fast decay of the higher modes. Another method is discussed which makes use also of higher modes. Evaluation formulas and optimal pile dimensions for this method are derived. The amplitudes of the normal modes are calculated for different initial distributions of the neutrons by means of the Fermi age theory. The error introduced using Fermi age theory was fixed moderator atoms for the slowing down process down to thermal energy is estimated. In one instance, for a simple initial distribution of thermal neutrons, the neutron density was calculated as a function of space and time. The data obtained were used to check the accuracy of some approximate evaluation formulas derived here. (auth)

Physical Description

Pages: 32

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  • Other Information: Orig. Receipt Date: 31-DEC-61

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  • Report No.: ANL-6254
  • Grant Number: W-31-109-ENG-38
  • DOI: 10.2172/4113496 | External Link
  • Office of Scientific & Technical Information Report Number: 4113496
  • Archival Resource Key: ark:/67531/metadc871834

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Office of Scientific & Technical Information Technical Reports

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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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  • November 1, 1960

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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Siems, R. & Melissaropoulos, M. A PULSED NEUTRON SOURCE TECHNIQUE, report, November 1, 1960; United States. (digital.library.unt.edu/ark:/67531/metadc871834/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.