Using the quantum Green's function formalism, we study the preequilibrium emission of complex particles in reactions of the form $A(\alpha, \beta)B$. After statistical averaging, we obtain expressions for the differential cross-sections of the reaction which is caused by the mechanism of the multistep direct process, multistep process via the compound nucleus, and to the combined multistep process. We obtain estimates of the factor for the transition "complex particle $\leftrightarrow$ quasi-particles".
Nuclear Interaction and Accelerator Department, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119991, Russia
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