Probability of U-235 fission happening

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SUMMARY

The probability of U-235 fission occurring is approximately 82%, with the remaining 18% attributed to other processes such as elastic scattering and the production of U-236. This information is derived from the ratio of the cross-section for slow neutron fission to the total cross-section for slow neutrons, which is roughly 84%. For detailed data, users can refer to the Japan Atomic Energy Agency's database at the provided link.

PREREQUISITES
  • Understanding of nuclear fission processes
  • Familiarity with neutron cross-sections
  • Knowledge of U-235 and its isotopes
  • Basic grasp of nuclear physics terminology
NEXT STEPS
  • Research neutron cross-section measurements for U-235
  • Explore the implications of U-236 decay processes
  • Study the role of elastic scattering in nuclear reactions
  • Investigate the Japan Atomic Energy Agency's resources on nuclear data
USEFUL FOR

Nuclear physicists, researchers in nuclear energy, and students studying fission processes will benefit from this discussion.

NewPhysi
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Where can I find information about the ~82% of U-235 nuclear fission happening and ~18% not happening?
 
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NewPhysi said:
Where can I find information about the ~82% of U-235 nuclear fission happening and ~18% not happening?

Where did you find those numbers? What do these percentages correspond? like 82% of what?
 
snorkack said:
One possible link:
https://wwwndc.jaea.go.jp/cgi-bin/Tab80WWW.cgi?lib=J40&iso=U235
What do you want to choose as denominator?

yea I figured that it was somewhat related to ## \dfrac{\sigma (\text{slow }n \text{ fission})}{\sigma (\text{slow }n \text{ total})} \approx 84 \%## the other important processes are just elastic scattering and production of U-236* which decays via gamma to U-236
 

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