Fast neutrons can easily be slowed down by

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(B) Fast neutrons are slowed down by passing them through a moderator. Materials containing light nuclei,such as water $(H_2O)$,heavy water $(D_2O)$,o

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Passing them through water

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(B) Fast neutrons are slowed down by passing them through a moderator. Materials containing light nuclei,such as water $(H_2O)$,heavy water $(D_2O)$,or graphite,are effective moderators. When a fast neutron collides elastically with a light nucleus (like hydrogen or deuterium),it transfers a significant portion of its kinetic energy to the nucleus,thereby reducing its speed. Therefore,passing neutrons through water is an effective method to slow them down.

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