Title: Sub-barrier resonance fission and its effects on fission fragment properties
Authors: TUDORA AnabellaHAMBSCH Franz-JosefOBERSTEDT Stephan
Citation: NUCLEAR PHYSICS A vol. 890-891 p. 77-101
Publication Year: 2012
JRC N°: JRC72847
ISSN: 0375-9474
URI: http://dx.doi.org/10.1016/j.nuclphysa.2012.07.006
DOI: 10.1016/j.nuclphysa.2012.07.006
Type: Articles in periodicals and books
Abstract: The correlation between the sub-barrier resonant behaviour of fission cross-section of non-fissile actinides (pre-scission stage) and the visible fluctuations of their fission fragment and prompt neutron data (post-scission stage) around the incident energies of sub-barrier resonances is outlined and supported by quantitative results in the case of 238U(n,f). A particular focus in our fission cross-section calculation was put on vibrational resonances at subthreshold neutron energies. The incorporation of the multi-modality in fission led to an integrative description of the sub-barrier resonant behaviour of fission cross-sections and of the fluctuations in the fission fragment properties. Through the Point-by-Point (PbP) treatment of prompt neutron emission and the multi-modal fission concept we arrived at a quantitative explanation of the observed fluctuations. The quantitative results refers to both stages of the fission process as following: a) The pre-scission stage including the neutron induced cross-section calculations with focus on the fission cross-section. Calculations are done in the frame of the refined statistical model for fission with sub-barrier effects, also extended to take into account the multi-modal fission. b) The post-scission stage including the prompt neutron emission treated in the frame of the PbP model. Total fission fragment and prompt neutron quantities as a function of incident neutron energy, obtained by averaging the PbP model results as a function of fragment over the fission fragment distributions, reveal variations around the energies of sub-barrier resonances in the fission cross-section.
JRC Directorate:Health, Consumers and Reference Materials

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