0-15 MeV中子诱发-(239)Pu裂变产额能量关系的评价研究

Objective To study the dependence of cumulative fission yields on incident-neutron energy for~(239)Pu(n,f).Methods The experimental yield data were evaluated by using codes AVERAGE for weighted average and ZOTT for simultaneous evaluation.The multi-modal model was used to calculate the energy dependence of yields.Results The experimental yield data were evaluated at different neutron energies for gas fission products ~(85)Kr~m,~(87) Kr,~(88)Kr and~(138)Xe resulting from the~(239)Pu(n,f) reaction.The energy dependence of the cumulative fission product yields on the incident neutron was presented and recommended.The evaluated curves of product yield versus neutron energy were compared with the results calculated by the TALYS code.Conclusions The energy curves of yield showed the rising trend for~(87)Kr and ~(88)Kr.but the linear functions for~(85)Kr~m and~(138)Xe.The multi.modal model calculation may qualitatively describe the energy dependence of yields for the~(239)Pu(n,f) reaction. Key words: ~(239)Pu;  Gas nuclides; Cumulative yield;  Energy dependence of yield