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The trapping effect is investigated close to the elastic threshold. The nucleus is described as an open quantum mechanical many-body system embedded in the continuum of decay channels. An ensemble of compound nucleus states with states below and above threshold is investigated in an energy-dependent formalism. It is shown that the states below threshold can trap the resonance ones and also that they can directly influence the scattering cross section. 1996 The American Physical Society.
Persson et al. (Sat,) studied this question.
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