Title: Calculation of the Reaction Cross Section for Several Actinides
Citation: IN: AIP Conference Proceedings ND 2004 vol. 769 p. 358-361
Publisher: American Institute of Physics
Publication Year: 2005
JRC N°: JRC34241
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC34241
Type: Articles in periodicals and books
Abstract: New, self-consistent, neutron-induced reaction cross-section calculations for 235,238U, 237Np, and 231,232,233Pa have been performed. The statistical model code STATIS was extended to take into account the multi-modality of the fission process. The three most dominant fission modes, the two asymmetric standard I (S1) and standard II (S2) modes, and the symmetric superlong (SL) mode have been taken into account. De-convoluted fission cross sections for these modes in 235,238U(n,f) and 237Np(n,f) based on experimental branching ratios, were calculated for the first time up to the second chance fission threshold. For 235U(n,f) and 233Pa(n,f), the calculations being made up to 50 MeV and 20 MeV incident neutron energy, respectively, higher fission chances have been considered. This implied the need for additional calculations for the neighbouring isotopes.As a side product also mass yield distributions could be calculated at energies hitherto not accessible by experiment. Experimental validation of the predictions is being envisaged.
JRC Directorate:Health, Consumers and Reference Materials

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