One more algorithm for generating elastic and inelastic scattering matrices

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Much effort in recent years has been spent on attempts to optimize the numerical problem of calculating elastic and inelastic multigroup scattering matrices from basic ENDF/B data. This paper presents an algorithm which minimizes the amount of data manipulation and approximation required. The algorithm is based on avoiding time-consuming transformations between c.m. and lab coordinates for the differential cross section and the additional requirement with the ETOG algorithm to manufacture Legendre expansion coefficients if tabular distributions are given. The new algorithm was incorporated into the ETOP code, which generates elastic and inelastic scattering matrices for the 68-group Phrog II fast ... continued below

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Pages: 3

Creation Information

Grimesey, R.A. January 1, 1975.

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  • Aerojet Nuclear Company
    Publisher Info: Aerojet Nuclear Co., Idaho Falls, Idaho (USA)
    Place of Publication: Idaho Falls, Idaho

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Description

Much effort in recent years has been spent on attempts to optimize the numerical problem of calculating elastic and inelastic multigroup scattering matrices from basic ENDF/B data. This paper presents an algorithm which minimizes the amount of data manipulation and approximation required. The algorithm is based on avoiding time-consuming transformations between c.m. and lab coordinates for the differential cross section and the additional requirement with the ETOG algorithm to manufacture Legendre expansion coefficients if tabular distributions are given. The new algorithm was incorporated into the ETOP code, which generates elastic and inelastic scattering matrices for the 68-group Phrog II fast spectrum code. CPU time is roughly a factor of 4 faster than the ETOG algorithm in the most favorable cases for ETOG. (RWR)

Physical Description

Pages: 3

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Dep. NTIS

Source

  • Joint meeting of the American Nuclear Society and the Atomic Industrial Forum, San Francisco, California, USA, 16 Nov 1975

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  • Report No.: CONF-751101--20
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4190189
  • Archival Resource Key: ark:/67531/metadc879400

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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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Creation Date

  • January 1, 1975

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 26, 2017, 3:24 p.m.

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Grimesey, R.A. One more algorithm for generating elastic and inelastic scattering matrices, article, January 1, 1975; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc879400/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.