Evaluation of the unresolved resonance range of sup 238 U
- Kernforschungszentrum Karlsruhe GmbH (Germany, F.R.). Inst. fuer Neutronenphysik und Reaktortechnik
The state of the JEF-2 evaluation of {sup 238}U + n cross sections in the region of unresolved resonances ({approximately} 10 to 300 keV) is reported with special emphasis on recent progress in theory (rigorous expressions for resonance-averaged cross sections with arbitrary level overlap), which permits reliable model-aided evaluation and parameterization by simultaneous fits to total, capture, and inelastic scattering cross-section data. Formalized inclusion of information from resolved resonances via Bayes' theorem has helped to remove discrepancies between resolved and unresolved parameters and has improved resonance statistics. Comparison with the latest ENDF/B-VI (pointwise) evaluations of the capture and the total cross sections shows agreement within 1 to 3%.
- OSTI ID:
- 6964238
- Journal Information:
- Nuclear Science and Engineering; (USA), Journal Name: Nuclear Science and Engineering; (USA) Vol. 103:2; ISSN 0029-5639; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
A=220 & above
Experimental
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYON REACTIONS
CROSS SECTIONS
EVEN-EVEN NUCLEI
HADRON REACTIONS
HEAVY NUCLEI
INELASTIC SCATTERING
ISOTOPES
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PARAMETRIC ANALYSIS
RADIOISOTOPES
SCATTERING
TOTAL CROSS SECTIONS
URANIUM 238
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES