The role of strong absorption of particles in intermediate and final states has been considered. The range of applicability of phenomenological models of absorption has been studied. This model is nonuniversal. Its applicability depends on the type of interaction Hamiltonian and matrix element used. We also demonstrate that the violation of the unitarity condition can produce a qualitative error in the results. The absorption (decay) in the final state does not tend to suppress the total process probability as well as the probability of the channel corresponding to absorption. This is true for the reactions, decays and n¯ conversion in the medium.
24.10.-i Nuclear reaction models and methods 24.50.+g Direct reactions 11.30.Fs Global symmetries (e.g. , baryon number, lepton number)
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