Electromagnetic transitions in near-threshold resonances

Near-threshold collectivization of continuum shell model eigenstates is investigated in $^{20}$O on the example of B(E$λ$) decays of 4$^+$ states in the vicinity of elastic and inelastic neutron threshold. Changes of the electromagnetic transition probabilities as a function of the continuum-coupling strength are explained by the corresponding evolution of the double poles of the scattering matrix.

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