The proton pygmy dipole resonances (PDRs) in the proton-rich nuclei ${}^{17,18}$Ne are investigated in the framework of the interacting shell model. The shell model with the self-consistent Skyrme-Hartree-Fock wave functions well reproduces the experimental data of the ground-state properties. The proton PDRs in the neighboring ${}^{17,18}$Ne are predicted. However, the detailed study involving the transition densities and collectivity shows that the PDR in ${}^{17}$Ne is highly collective and due to the oscillation of the valence protons against the interior core, while in ${}^{18}$Ne the dipole resonance in the PDR region is noncollective and more likely to be the configuration splitting of the giant dipole resonances.

• Received 8 February 2012

DOI:https://doi.org/10.1103/PhysRevC.85.044307