Question

How are fast moving neutrons slowed down with the use of moderators?

Answer 1

Thermal neutrons have moderatorsthat allow many neutrons to slow down to thermal energies (i.e. thespeed that atoms are vibrating in the surrounding materials due to their temperature) whereas fast reactors don't have a moderator and theirneutrons stay at high energies (i.e. they move fast).

Answer 2

Thermal neutrons have moderatorsthat allow many neutrons to slow down to thermal energies (i.e. thespeed that atoms are vibrating in the surrounding materials due to their temperature) whereas fast reactors don't have a moderator and theirneutrons stay at high energies (i.e. they move fast)