Heuristic derivation of Rossi-alpha formula with delayed neutrons and correlated source

摘要

Formulae of neutron correlation measurements, such as Feynman- and Rossi-alpha, have been derived in the past by the master equation method or the joint detection probability method. Generally speaking, the master equation method is rigorous in the sense. That all elementary processes can be taken into account, but its manipulations are complicated and elaborate. On the other hand, the method of joint detection probability is heuristic, but Several kinds of formulae can be easily derived from it. It seems that these Methods are complementary.