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Title: Template for estimating uncertainties of measured neutron-induced fission cross-sections

Journal Article · · EPJ Nuclear Sciences and Technologies
DOI:https://doi.org/10.1051/epjn/2018026· OSTI ID:1489948
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [1];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Argonne National Laboratory, Coronado, CA (United States)
  3. International Atomic Energy Agency, Vienna (Austria)
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A template for estimating uncertainties (unc.) of measured neutron-induced fission, (n,f), cross-sections (cs) is presented. This preliminary template not only lists all expected unc. sources but also supplies ranges of unc., estimates for correlations between unc. of the same and different experiments which can be used if the information is nonexistent. If this template is applied systematically when estimating experimental covariances for an evaluation, it may help in pinpointing missing unc. for individual datasets, identifying unreasonably low unc., and estimating correlations between different experimental datasets. Thus, a detailed unc. estimate – usually, a time-intensive procedure – can be undertaken more consistently and efficiently. As an example, it is shown that unc. and correlations of 239Pu(n,f) by Merla et al. [Proceedings of the Conference on Nuclear Data for Science and Technology 1991 Jülich (Springer-Verlag, Berlin, 1992) pp. 510–513], which are questionably low in the GMA database underlying the neutron cs standards evaluations, are distinctly larger at 14.7 MeV and more strongly correlated if this template is used for reestimating the associated covariances.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC52-06NA25396
OSTI ID:
1489948
Report Number(s):
LA-UR-17-29963
Journal Information:
EPJ Nuclear Sciences and Technologies, Vol. 4; ISSN 2491-9292
Country of Publication:
United States
Language:
English

References (5)

Evaluation of the Neutron Data Standards journal February 2018
A Monte Carlo computer program for the transport of energetic ions in amorphous targets journal August 1980
The Need for Precise and Well-documented Experimental Data on Prompt Fission Neutron Spectra from Neutron-induced Fission of 239Pu journal January 2016
Towards a More Complete and Accurate Experimental Nuclear Reaction Data Library (EXFOR): International Collaboration Between Nuclear Reaction Data Centres (NRDC) journal June 2014
A time projection chamber for high accuracy and precision fission cross-section measurements
  • Heffner, M.; Asner, D. M.; Baker, R. G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 759 https://doi.org/10.1016/j.nima.2014.05.057
journal September 2014

Figures / Tables (5)

Table 1(p. 4)table Table 1
Table 2(p. 5)table Table 2
Fig. 1(p. 9)figure Fig. 1
Table 3(p. 9)table Table 3
Fig. 2(p. 10)figure Fig. 2

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY