Electromagnetic transitions in near-threshold resonances
J. Oko{\l}owicz, M. P{\l}oszajczak
TL;DR
This paper investigates how electromagnetic transition probabilities in near-threshold resonances, specifically in $^{20}$O, evolve with continuum coupling, linking these changes to the behavior of scattering matrix poles.
Contribution
It introduces a detailed analysis of electromagnetic transitions near thresholds using continuum shell model eigenstates and scattering matrix pole evolution.
Findings
Transition probabilities vary with continuum-coupling strength.
Double poles of the scattering matrix explain changes in electromagnetic decays.
Near-threshold resonances exhibit collectivization effects.
Abstract
Near-threshold collectivization of continuum shell model eigenstates is investigated in O on the example of B(E) 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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