Calculation of resonance self-shielding for {sup 235}U from 0 to 2250 eV
- Oak Ridge National Lab., TN (United States)
- Cidade Univ., Rio de Janeiro (Brazil). Inst. de Engenharia Nuclear
Over the years, the evaluated {sup 235}U cross sections in the resolved energy range have been extensively revised. A major accomplishment was the first evaluation released to the ENDF/B-VI library. In that evaluation, the low energy range bound was lowered to 10{sup {minus}5} eV, and the upper limit raised to 2,250 eV. Several high-resolution measurements in conjunction with the Bayesian computer code SAMMY were used to perform the analysis of the {sup 235}U resonance parameters. SAMMY uses the Reich-Moore formalism, which is adequate for representing neutron cross sections of fissile isotopes, and a generalized least-squares (Bayes) technique for determining the energy-dependence of the neutron cross sections. Recently a re-evaluation of the {sup 235}U cross section in the resolved resonance region was completed. This evaluation has undergone integral tests in various laboratories throughout the USA and abroad. The evaluation has been accepted for inclusion in ENDF/B-VI release 5. The intent of this work is to present results of calculations of self-shielded fission rates carried out with these resonance parameters and to compare those fission rates with experimental data. Results of this comparison study provide an assessment of the resonance parameters with respect to the calculation of self-shielded group cross sections.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 666165
- Report Number(s):
- ORNL/CP-98822; CONF-981003-; ON: DE98007158; BR: AT150402B; TRN: 99:000279
- Resource Relation:
- Conference: International conference on the physics of nuclear science and technology, Long Island, NY (United States), 5-8 Oct 1998; Other Information: PBD: [1998]
- Country of Publication:
- United States
- Language:
- English
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