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We study the ground-state structure of nuclei in the vicinity of theone-neutron dripline within the latest version of the quark-meson coupling(QMC) model with a particular emphasis on 23O. For this nucleus the modelpredicts a [22O(0+) + n (2s_{1/2})] configuration for its ground state, with aone neutron separation energy in close agreement with the correspondingexperimental value. The wave function describing the valence neutron-corerelative motion was then used to calculate the Coulomb dissociation of 23O on alead target at a beam energy of 422 MeV/nucleon. The experimental neutron-corerelative energy spectrum and the total one-neutron removal cross sections arewell described by the calculations. The widths of the longitudinal momentumdistributions of the 22O fragment are found to be broad, which do not supportthe formation of a neutron halo in this nucleus.

Structure and Coulomb dissociation of 23O within the quark-meson coupling model