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A discussion on the nature of the 0+ states in 68Ni (Z=28, N=40) is presentedand a comparison is made with its valence counterpart 90Zr (Z=40, N=50).Evidence is given for a 0+ proton intruder state at only ~2.2 MeV excitationenergy in 68Ni, while the analogous neutron intruder states in 90Zr reside at4126 keV and 5441 keV. The application of a shell-model description of 0+intruder states reveals that many pair-scattered neutrons across N=40 have tobe involved to explain the low excitation energy of the proton-intruderconfiguration in 68Ni.

Pairing-excitation versus intruder states in 68Ni and 90Zr