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Why are light nuclei used for moderators instead of heavy nuclei?

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Energy input is required to fuse medium-mass nuclei, such as iron or cobalt, into more massive nuclei. Explain why
Some heavy nuclei, containing even more protons than the uranium nucleus undergo “spontaneous fission,” splitting apart without absorbing a neutron. Why is spontaneous fission observed only in the heaviest nuclei?
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Consider two heavy nuclei X and Y having similar mass numbers. If X has the higher binding energy, which nucleus tends to be more unstable?
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