| Autor: |
V. Zammit-Averlant, M. Salvatores, A. Filip, E. Fort, J-F Lebrat |
| Rok vydání: |
2002 |
| Předmět: |
|
| Zdroj: |
Progress in Nuclear Energy. 41:317-359 |
| ISSN: |
0149-1970 |
| DOI: |
10.1016/s0149-1970(02)00017-3 |
| Popis: |
Today there is no well-established theoretical model to predict the fission delayed neutron yield vd with the required accuracy. In this field the recommended data result from the rare experimental data analysis or from purely phenomenological or semi-phenomenological models. There is another source of valuable information: the related integral data or βeff- data. In this report we demonstrate, via a careful analysis of the experimental methods leading to revisited experimental βeff values and associated uncertainties, that for the major nuclei the vd evaluated data are of acceptable quality. For U-235 U-238 and Pu-239 we recommend vd values for the thermal and the fast reactor ranges which have been obtained from a statistical consistent adjustment to the βeff data. In the course of this study we show that the energy dependence of vd, suspected from a physics point of view, probably exists with a different magnitude according to the nucleus. Concerning the major nuclei it is of negligible importance for the applications. The improvement of the higher Pu isotopes and minor actinides data is the main motivation for developing the theoretical investigations of the delayed neutron generation mechanism at the same level as the necessary experimental activity. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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