Examination of various roles for covariance matrices in the development, evaluation, and application of nuclear data

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The last decade has been a period of rapid development in the implementation of covariance-matrix methodology in nuclear data research. This paper offers some perspective on the progress which has been made, on some of the unresolved problems, and on the potential yet to be realized. These discussions address a variety of issues related to the development of nuclear data. Topics examined are: the importance of designing and conducting experiments so that error information is conveniently generated; the procedures for identifying error sources and quantifying their magnitudes and correlations; the combination of errors; the importance of consistent and well-characterized measurement ... continued below

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9 pages

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Smith, D.L. January 1, 1988.

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Description

The last decade has been a period of rapid development in the implementation of covariance-matrix methodology in nuclear data research. This paper offers some perspective on the progress which has been made, on some of the unresolved problems, and on the potential yet to be realized. These discussions address a variety of issues related to the development of nuclear data. Topics examined are: the importance of designing and conducting experiments so that error information is conveniently generated; the procedures for identifying error sources and quantifying their magnitudes and correlations; the combination of errors; the importance of consistent and well-characterized measurement standards; the role of covariances in data parameterization (fitting); the estimation of covariances for values calculated from mathematical models; the identification of abnormalities in covariance matrices and the analysis of their consequences; the problems encountered in representing covariance information in evaluated files; the role of covariances in the weighting of diverse data sets; the comparison of various evaluations; the influence of primary-data covariance in the analysis of covariances for derived quantities (sensitivity); and the role of covariances in the merging of the diverse nuclear data information. 226 refs., 2 tabs.

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9 pages

Notes

NTIS, PC A02/MF A01; 1.

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  • International conference on nuclear data for science and technology, Mito, Japan, 30 May 1988

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  • Other: DE88011953
  • Report No.: CONF-880546-25
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 6990029
  • Archival Resource Key: ark:/67531/metadc1192642

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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.

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  • January 1, 1988

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  • July 2, 2018, 10:52 p.m.

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  • June 10, 2019, 9:42 a.m.

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Smith, D.L. Examination of various roles for covariance matrices in the development, evaluation, and application of nuclear data, article, January 1, 1988; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1192642/: accessed July 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.