Abstract
We introduce the main tool to describe emission processes, namely Gamow resonances. The reduced width and penetrabilitry are defined. Then we analyze the experimental material in terms of the Geiger–Nuttall law for different emission processes. We introduce the double folding procedure, as the most general method to compute the inter-fragment phenomenological potential. The problem how the binary system is born from the initial nucleus is described in terms of the phenomenological spectroscopic factor, defined as the ratio between computed and experimental half lives. It turns out, that half lives of α-decays or heavy cluster emission processes, predicted by phenomenological potentials describing scattering data, are too short. This feature is a signature that such clusters do not exist as free components on the nuclear surface.
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