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

Abstract

Nuclear spins and precise values of the magnetic dipole and electric quadrupole moments of the ground-states of neutron-rich ${}^{76-78}$Cu isotopes were measured using the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE, CERN. The nuclear moments of the less exotic ${}^{73,75}$Cu isotopes were re-measured with similar precision, yielding values that are consistent with earlier measurements. The moments of the odd-odd isotopes, and ${}_{29}^{78}$Cu ($N=49$) in particular, are used to investigate excitations of the assumed doubly-magic ${}^{78}$Ni core through comparisons with large-scale shell-model calculations. Despite the narrowing of the $Z=28$ shell gap between $N\sim 45$ 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 by the present moment measurements.

References in corpus (5)

• Nuclear magic numbers: new features far from stability
• Evolution of the N=50 shell gap energy towards ${}^{78}$Ni
• Nuclear spins, magnetic moments and quadrupole moments of Cu isotopes from N = 28 to N = 46: probes for core polarization effects
• Magnetic dipole moment of 57,59Cu measured by in-gas-cell laser spectroscopy
• beta-decay study of Cu-77

Cited by in corpus (10)

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• King-plot analysis of isotope shifts in simple diatomic molecules
• The N=50 and Z=28 shell closure revisited
• The 76Cu conundrum remains unsolved
• Voltage scanning and technical upgrades at the Collinear Resonance Ionization Spectroscopy experiment
• Reference Quadrupole Moments of Transition Elements from Lamb Shifts in Muonic Atoms