Theory in evaluation of actinide fission and capture cross sections.
- J. Eric
The authors discuss the possibilities and limitations of the use of theory as a tool in the evaluation of actinide fission and capture cross-sections. They consider especially the target {sup 235}U as an example. They emphasize the roles of intermediate structure in the fission cross-section and of level width fluctuations in both intermediate structure and fine structure, noting that these lead to a breakdown of Hauser-Feshbach theory at sub-barrier and near barrier energies. At higher energies (where fluctuation-averaged Hauser-Feshbach theory is applicable) semi-quantitative and intuitive representations of transition state spectra and barrier level density functions have to be tested against experimental data wherever these are available. Adjustment of the fission cross-section against inelastic scattering to the much better known levels of the residual nucleus should then lead to a fairly sound estimate of the capture cross-section. They compare such estimates with evaluated and experimental data for {sup 235}U.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 977902
- Report Number(s):
- LA-UR-04-7295; TRN: US1003643
- Resource Relation:
- Journal Volume: 769; Conference: Submitted to: Proceedings Intl. Conf. on Nuclear Data For Science&Tech ., ND2004, Santa Fe, NM, Sept. 26 - Oct. 1, 2004
- Country of Publication:
- United States
- Language:
- English
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