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

Mark Bissell, T. Carette, Kieran Flanagan, P. Vingerhoets, Jonathan Billowes, K. Blaum, Bradley Cheal, S. Fritzsche, M. Godefroid, M. Kowalska, J. Kramer, R. Neugart, G. Neyens, W. Nortershauser, D. T. Yordanov

    Research output: Contribution to journalArticlepeer-review


    Collinear laser spectroscopy on 58–75Cu 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 inmean-square charge radii δr2A,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 δr2A,A
    with a droplet model prediction
    including static deformation deduced from the spectroscopic quadrupole moments, points to the persistence of
    correlations at N = 40.
    Original languageEnglish
    Pages (from-to)064318-1 - 064318-7
    Number of pages7
    JournalPhysical Review C - Nuclear Physics
    Publication statusPublished - 17 Jun 2016


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