| The postulate of Fano to develop the configuration interaction description of weakly bound or unbound energy levels which would be fully symmetric in treatment of bound, resonance, and scattering single-particle states has been realized recently with the development of a modern continuum shell model. We discuss salient non-perturbative effects of the configuration mixing induced by the configuration interaction in nuclear many-body states near the dissociation limit (the particle-emission threshold), which find a natural formulation in the non-hermitian framework of the continuum shell model. |
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