Sub-barrier resonance fission and its effects on fission fragment properties, exemplified on234,238U(n,f)

A Tudora,F.-J Hambsch,S Oberstedt

doi:10.1051/epjconf/20134206001

A Tudora, F.-J Hambsch + Show 1 more

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https://doi.org/10.1051/epjconf/20134206001

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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 for two fissioning systems 234,238 U(n,f). These quantitative results refer to both stages of the fission process: a) The pre-scission stage including the calculation of neutron induced cross-sections with focus on fission. 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 Point-by-Point model. Total quantities characterizing the fission fragments and the prompt neutrons obtained by averaging the Point-by-Point 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.

Highlights

The correlation between the sub-barrier resonant behaviour of fission crosssection of non-fissile actinides and the visible fluctuations of their fission fragment and prompt neutron data around the incident energies of sub-barrier resonances is outlined and supported by quantitative results for two fissioning systems 234,238U(n,f). These quantitative results refer to both stages of the fission process: a) The pre-scission stage including the calculation of neutron induced cross-sections with focus on fission
Calculations are done in the frame of the refined statistical model for fission with sub-barrier effects 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 Point-by-Point model
Total quantities characterizing the fission fragments and the prompt neutrons obtained by averaging the Point-by-Point results as a function of fragment over the fission fragment distributions reveal variations around the energies of sub-barrier resonances in the fission crosssection

Summary

Introduction

The correlation between the sub-barrier resonant behaviour of fission crosssection 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 for two fissioning systems 234,238U(n,f). 238U(n,f) fission cross-section (upper part, experimental data with different symbols and present calculation with red solid line) and experimental data (lower part with full squares) in the En range focusing the sub-barrier resonances.

Results

Conclusion