Nuclear spins, magnetic moments and quadrupole moments of Cu isotopes from N = 28 to N = 46: probes for core polarization effects

Abstract

Measurements of the ground-state nuclear spins, magnetic and quadrupole moments of the copper isotopes from 61Cu up to 75Cu are reported. The experiments were performed at the ISOLDE facility, using the technique of collinear laser spectroscopy. The trend in the magnetic moments between the N=28 and N=50 shell closures is reasonably reproduced by large-scale shell-model calculations starting from a 56Ni core. The quadrupole moments reveal a strong polarization of the underlying Ni core when the neutron shell is opened, which is however strongly reduced at N=40 due to the parity change between the $pf$ and $g$ orbits. No enhanced core polarization is seen beyond N=40. Deviations between measured and calculated moments are attributed to the softness of the 56Ni core and weakening of the Z=28 and N=28 shell gaps.

13 pagers, 19 figures, accepted by Physical Review C

References in corpus (4)

• High-precision mass measurements of nickel, copper, and gallium isotopes and the purported shell closure at N=40
• Magnetic dipole moment of 57,59Cu measured by in-gas-cell laser spectroscopy
• Low Energy States of ${}_{31}^{81}G{a}_{50}$ : Elements on the Doubly-Magic Nature of ${}^{78}$Ni
• Enhanced collectivity in 74Ni

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• Charge radii of ${}^{55,56}$Ni reveal a surprisingly similar behavior at $N=28$ in Ca and Ni isotopes
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• Measurement of the $\beta$-asymmetry parameter of ${}^{67}$Cu in search for tensor type currents in the weak interaction
• Nuclear Moments of Germanium Isotopes around $N$ = 40
• Hyperfine Field and Hyperfine Anomalies of Copper Impurities in Iron
• Electromagnetic moments of the odd-mass nickel isotopes ${}^{59-67}$Ni
• Fast-timing study of ${}^{81}$Ga from the $\beta$ decay of ${}^{81}$Zn
• Particle-phonon coupling effects within theory of finite Fermi systems
• Reference Quadrupole Moments of Transition Elements from Lamb Shifts in Muonic Atoms