Stochastic theory of zero-power nuclear reactors. Part 3. Stochastic differential equations of zero-dimensional reactor kinetics. Weak external neutron source. Analysis of an equivalent reactivity noise model

Stochastic differential equations of zero-dimensional reactor kinetics have been derived assuming that the discrete branching process and its continuous analog have moments of distribution converging up to the second order inclusively. The notion of weak external neutron source has been defined more accurately. Cohn's model has been comparatively analyzed against the reactivity noise model introduced by analogy with the Schottky effect.