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In a nuclear reactor, the effective multiplication factor (k) is defined as the ratio of the number of neutrons in one generation to the number in the preceding generation. For an infinite reactor with no neutron leakage, this factor is denoted by (k_\infty). The four factor formula expresses (k_\infty) in terms of four fundamental physical processes that occur as neutrons slow down and cause fission. Consider one neutron produced by fission. The average number of fast neutrons produced per thermal neutron absorbed in fuel is denoted by (\eta). Thus, starting with one thermal neutron absorbed in fuel, the number of fast neutrons produced is (\eta). Not all these fast neutrons come solely from thermal fission; some additional fast neutrons are produced due to fast fission in fertile materials such as (^{238}\text{U}). The fast ___ ________ _________ _______ _______ ___ __________ _________ ______ _________ _____.
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