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The evolution of the N=50 gap is analyzed as a function of the occupation ofthe proton f5/2 and p3/2 orbits. It is based on experimental atomic masses,using three different methods of one or two-neutron separation energies ofground or isomeric states. We show that the effect of correlations, which ismaximized at Z=32 could be misleading with respect to the determination of thesize of the shell gap, especially when using the method with two-neutronseparation energies. From the methods that are the least perturbed bycorrelations, we estimate the N=50 spherical shell gap in 78Ni. Whether 78Niwould be a rigid spherical or deformed nucleus is discussed in comparison withother nuclei in which similar nucleon-nucleon forces are at play.

Evolution of the N=50 gap from Z=30 to Z=38 and extrapolation towards 78Ni