Cu charge radii reveal a weak sub-shell effect at N=40

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.
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Submitted on : Monday, July 11, 2016 - 3:33:47 PM
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M. L. Bissell, T. Carette, K. T. Flanagan, P. Vingerhoets, J. Billowes, et al.. Cu charge radii reveal a weak sub-shell effect at N=40. Physical Review C, American Physical Society, 2016, 93 (6), pp.064318. ⟨10.1103/PhysRevC.93.064318⟩. ⟨in2p3-01344282⟩

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