Arrangement of fissile materialAny substance which can be fissioned by neutrons, during whi... and any moderatorMaterial used to "decelerate" fast neutrons to low energies,..., the multiplication factorRatio of neutron number in a neutron generation to the neutr... of which is below 1 and thus a chain reactionSelf-perpetuating reaction. In a fission chain reaction, a f... cannot be maintained.
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