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Mixing of bound and unbound levels. (English) Zbl 0994.81046
Summary: We consider a system of two discrete levels coupled to a channel. The levels are close to the channel threshold. We investigate the influence of the channel threshold on positions and widths of the levels. We introduce a simple parameterization of the energy dependence of the coupling matrix elements. Simple examples demonstrate the importance of this dependence.
81Q99 General mathematical topics and methods in quantum theory
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