Fission Reaction: How Many Neutrons Needed for Chain Reaction?

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SUMMARY

In a fission reaction that releases three neutrons, at least one of these neutrons must induce another fission reaction to sustain a chain reaction. The neutrons produced are typically fast neutrons, which require moderation to thermal energies to effectively cause further fission in materials with high cross-sections for thermal neutrons. This moderation is crucial for maintaining the chain reaction, particularly in nuclear reactors.

PREREQUISITES
  • Understanding of nuclear fission processes
  • Knowledge of neutron moderation techniques
  • Familiarity with fissionable materials and their cross-sections
  • Basic principles of chain reactions in nuclear physics
NEXT STEPS
  • Research neutron moderation methods in nuclear reactors
  • Study the cross-section values of various fissionable materials
  • Explore the principles of chain reactions in nuclear physics
  • Learn about fast and thermal neutrons and their interactions
USEFUL FOR

Nuclear physicists, engineering students, and anyone interested in the principles of nuclear fission and chain reactions.

gurumi
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a certain fission reaction releases 3 neutrons.

how many of these neutrons must go on to produce a subsequent fission if a chain reaction is to be sustained?
 
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is this homework ? looks like it

how about posting in the homework section and use the proper template
and show us what you have discovered so far in your research on the subject :smile:Dave
 
To sustain a chain reaction each individual reaction must produce at least one more reaction so at least one of the three neutrons released in a reaction must result in another fission reaction for the reaction to be sustained. The released neutrons will normally be highly energetic fast neutrons and at least for fissionable materials with high cross-sections for thermal neutrons, the energy of the neutrons must be reduced to thermal energies before a fission reaction is likely to take place.
 

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