A Probability of U-235 fission happening

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The discussion centers on the probability of U-235 fission, specifically the approximate 82% occurrence rate and the 18% non-occurrence rate. Participants seek clarification on the origin of these percentages and their specific context. Links to relevant data sources are provided, emphasizing the importance of selecting an appropriate denominator for accurate interpretation. Additionally, the relationship between fission probabilities and other processes, such as elastic scattering and U-236 production, is noted. Understanding these dynamics is crucial for comprehending U-235 fission behavior.
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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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