Physics · Nuclei
In a nuclear reactor, moderators slow down the fast neutrons that come out in a fission process. The moderators used typically consist of light nuclei. Heavy nuclei will not serve the purpose because:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1substances with heavy nuclei do not occur in liquid or gaseous states at room temperature.
- 2the net weight of the reactor would become unbearably high.
- 3elastic collisions of neutrons with heavy nuclei will transfer very little energy and fail to slow them down significantly.✓
- 4they will break up into smaller fragments upon impact.
Correct answer
elastic collisions of neutrons with heavy nuclei will transfer very little energy and fail to slow them down significantly.
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