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Nuclear spins and precise values of the magnetic dipole and electricquadrupole moments of the ground-states of neutron-rich $^{76-78}$Cu isotopeswere measured using the Collinear Resonance Ionization Spectroscopy (CRIS)experiment at ISOLDE, CERN. The nuclear moments of the less exotic $^{73,75}$Cuisotopes were re-measured with similar precision, yielding values that areconsistent with earlier measurements. The moments of the odd-odd isotopes, and$^{78}_{29}$Cu ($N=49$) in particular, are used to investigate excitations ofthe assumed doubly-magic $^{78}$Ni core through comparisons with large-scaleshell-model calculations. Despite the narrowing of the $Z=28$ shell gap between$N\sim45$ and $N=50$, the magicity of $Z=28$ and $N=50$ is restored towards$^{78}$Ni. This is due to weakened dynamical correlations, as clearly probed bythe present moment measurements.

Dipole and quadrupole moments of $^{73-78}$Cu as a test of the robustness of the $Z=28$ shell closure near $^{78}$Ni