Global trends of nuclear d5/22,3,4 configurations

With new experimental information on nuclei far from stability being available, a systematic investigation of excitation energies and electromagnetic properties along the N=10,11,12 isotones and Z=10,11,12 isotopes is presented. The experimental data are discussed in the context of the appearance and disappearance of shell closures at N=Z=8,14,16,20, and compared to an effective-interaction approach applied to neutrons and protons in d5/22,3,4 configurations. In spite of its simplicity the model is able to explain the observed properties.