Evaluating fission neutron-multiplicity data

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The present work had its origins in the practical need to obtain P[sub [nu]] for the purpose of calculating the theoretical response of instrumentation that used a correlation technique to assay spontaneously fissioning nuclides. The assay results are proportional to the factorial moments calculated with the P[sub [nu]] distribution. Obtaining experimentally derived sets of P[sub [nu]] from many sources reported over several decades led immediately to the problem of evaluating the data: Aside from the trivial problem of sometimes not being properly normalized, the first moments ([nu]) = ([nu]) = [Sigma][nu]P[sub [nu]] were typically not in accord with the best ... continued below

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9 pages

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Zucker, M. S. & Holden, N. E. January 1, 1992.

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Description

The present work had its origins in the practical need to obtain P[sub [nu]] for the purpose of calculating the theoretical response of instrumentation that used a correlation technique to assay spontaneously fissioning nuclides. The assay results are proportional to the factorial moments calculated with the P[sub [nu]] distribution. Obtaining experimentally derived sets of P[sub [nu]] from many sources reported over several decades led immediately to the problem of evaluating the data: Aside from the trivial problem of sometimes not being properly normalized, the first moments ([nu]) = ([nu]) = [Sigma][nu]P[sub [nu]] were typically not in accord with the best recent evaluations, or the calibration of detector efficiency was based on obsolete values for ([nu]) for supposedly well-characterized standard'' nuclides such as [sup 252]Cf. The problem of evaluating P[sub [nu]] is unusual in that, compared to the usual situation where the quantities being evaluated are single numbers, the P[sub [nu]] are sets of numbers, that moreover, are constrained so that [Sigma]P[sub [nu]][triple bond] 1 and [Sigma][nu] P[sub [nu]] = ([nu]), where ([nu]) is usually determined more accurately from a separate experiment than it can be calculated from the experimentally derived P[sub [nu]] distribution.

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9 pages

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OSTI; NTIS; INIS; GPO Dep.

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  • Symposium on nuclear data evaluation methodology, Upton, NY (United States), 12-16 Oct 1992

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  • Other: DE93005536
  • Report No.: BNL-48109
  • Report No.: CONF-921046--14
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 6818088
  • Archival Resource Key: ark:/67531/metadc1199113

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1992

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  • July 2, 2018, 10:52 p.m.

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  • May 21, 2019, 11:21 a.m.

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Zucker, M. S. & Holden, N. E. Evaluating fission neutron-multiplicity data, article, January 1, 1992; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1199113/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.