A weak-coupling model for the even Zn isotopes

The low-lying structures of even zinc isotopes are studied as the weak coupling of vibrational states of protons and neutrons obtained from shell-model calculations. In spite of its simplicity, the model is capable of describing the known level structure and E2 transition rates as well as producing reliable two-proton transfer amplitudes. Extensions to include other even–even nuclei such as Ge, Se, and Kr are also discussed.