On uncertainty evaluation and fluctuations in the resolved and unresolved resonance regions
- Institut fuer Neutronenphysik und Reaktortechnik, Karlsruhe (Germany)
Evaluators face special problems in the resolved and unresolved resonance regions where cross sections are not given directly in the evaluated files but only in the form of individual or statistical resonance parameters. Combination of resolved parameter sets is difficult if they are derived from data taken with widely differing energy resolution. Systematic uncertainties from calibration or background subtraction get lost if in the usual least-squares parametrization all data points are treated as statistically independent. Evaluations in the unresolved resonance region must cope with, and distinguish between, unobserved genuine cross section fluctuations and uncertainties. Recent evaluation work on Fe and {sup 238}U illustrates (1) how these problems can be addressed and (2) how unobserved total cross section fluctuations can be predicted with level statistical methods (Hauser-Feshbach theory).
- OSTI ID:
- 62072
- Report Number(s):
- CONF-940507-Vol.2; TRN: 95:002916-0001
- Resource Relation:
- Conference: International conference on nuclear data for science and technology: nuclear data for the twenty-first century, Gatlinburg, TN (United States), 9-13 May 1994; Other Information: PBD: 1994; Related Information: Is Part Of Proceedings of the international conference nuclear data for science and technology. Volume 2; Dickens, J.K. [ed.]; PB: 571 p.
- Country of Publication:
- United States
- Language:
- English
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