Abstract
Collinear laser spectroscopy on Cu58-75 isotopes was performed at the CERN-ISOLDE radioactive ion beam facility. In this paper we report on the isotope shifts obtained from these measurements. State-of-the-art atomic physics calculations have been undertaken in order to determine the changes in mean-square charge radii δ(r2)A,A′ from the observed isotope shifts. A local minimum is observed in these radii differences at N=40, providing evidence for a weak N=40 sub-shell effect. However, comparison of δ(r2)A,A′ with a droplet model prediction including static deformation deduced from the spectroscopic quadrupole moments, points to the persistence of correlations at N=40.
Highlights
Shell structure in atomic nuclei is known to evolve with N and Z and this has attracted significant attention in the last decades in different regions of the nuclear chart [1]
In this paper we report on the isotope shifts obtained from these measurements
The bunches of ions were guided to the collinear laser spectroscopy setup where they were neutralized in a sodium-filled charge exchange cell (CEC)
Summary
Shell structure in atomic nuclei is known to evolve with N and Z and this has attracted significant attention in the last decades in different regions of the nuclear chart [1]. Mk and Fk are, respectively, the mass-shift and fieldshift parameters, both depending on the electronic transition From this point the quantity δ r2 will be used without superscripts where A refers to our common reference isotope 65Cu. Since the mean-square charge radius is known experimentally only for two Cu isotopes, accurate electronic structure calculations are required in order to deduce δ r2 from the measured isotope shifts. Since the mean-square charge radius is known experimentally only for two Cu isotopes, accurate electronic structure calculations are required in order to deduce δ r2 from the measured isotope shifts To obtain these essential atomic parameters for Cu, state-of-the-art multiconfiguration DiracHartree-Fock calculations have been performed, permitting a confident interpretation of the measured isotope shifts
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