Conclusion
The development of techniques for measuring cross-sections has permitted a considerable extension of the range of energies over which these measurements can be carried out with a resolution that is sufficiently high for analysis; simultaneously, the range of nuclei studied has been extended.
However, certain difficulties have appeared in processing the experimental data which complicate the interpretation of the results obtained. It is possible to compute more or less reliably the established form of statistical distributions of the level parameters only for Pu239. For fissile nuclei such as U233, U235 and Pu241, the nature of the distributions indicates the existence of significant distortions, associated with the methods of data processing used. Analysis of cross-section models of fissile nuclei shows that the origin of these distortions is associated with both the neglect of interference effects and difficulties of principles, raising doubt on the feasibility of carrying out unambiguous cross-section analysis. In order to verify this conclusion, it is necessary to carry out careful interference analysis of cross-sections over wider energy ranges.
At present, the possibilities of processing cross-sections are limited by insufficiently high measurement accuracy of cross-sections between resonances and the absence of information about spin mechanisms of the levels. In order to increase the reliability of the analysis it will be necessary to undertake measurements of the energy dependence of η and the radiative capture cross-sections of the nuclei studied.
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Translated from Atomnaya Énergiya, Vol. 23, No. 1, pp. 6–19, July, 1967.
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Kirpichnikov, I.V. Parameters of the resonance levels of fissile nuclei (review). At Energy 23, 669–682 (1967). https://doi.org/10.1007/BF01565716
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DOI: https://doi.org/10.1007/BF01565716