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This contribution reports recent investigations on low-energy scaling properties of three-body systems, by considering elastic s−wave collisions of a particle in a bound-state formed by the remaining two-body system. First, some previous results for the case of the halo nucleus 20 C will be revised, for the neutron− 19 C scattering properties near the critical condition for the occurrence of an excited bound state in 20 C, within a neutron−neutron− 18 C configuration. In our approach, wedoi:10.1088/1742-6596/915/1/012002 fatcat:dtluviwsizhe5awwrhuvlednma