Measurement and microscopic description of odd–even staggering of charge radii of exotic copper isotopes
Author(s)de Groote, RP; Billowes, J; Binnersley, CL; Bissell, ML; Cocolios, TE; Day Goodacre, T; Farooq-Smith, GJ; Fedorov, DV; Flanagan, KT; Franchoo, S; Garcia Ruiz, RF; Gins, W; Holt, JD; Koszorús, Á; Lynch, KM; Miyagi, T; Nazarewicz, W; Neyens, G; Reinhard, P-G; Rothe, S; Stroke, HH; Vernon, AR; Wendt, KDA; Wilkins, SG; Xu, ZY; Yang, XF; ... Show more Show less
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© 2020, The Author(s), under exclusive licence to Springer Nature Limited. Nuclear charge radii globally scale with atomic mass number A as A1∕3, and isotopes with an odd number of neutrons are usually slightly smaller in size than their even-neutron neighbours. This odd–even staggering, ubiquitous throughout the nuclear landscape1, varies with the number of protons and neutrons, and poses a substantial challenge for nuclear theory2–4. Here, we report measurements of the charge radii of short-lived copper isotopes up to the very exotic 78Cu (with proton number Z = 29 and neutron number N = 49), produced at only 20 ions s–1, using the collinear resonance ionization spectroscopy method at the Isotope Mass Separator On-Line Device facility (ISOLDE) at CERN. We observe an unexpected reduction in the odd–even staggering for isotopes approaching the N = 50 shell gap. To describe the data, we applied models based on nuclear density functional theory5,6 and A-body valence-space in-medium similarity renormalization group theory7,8. Through these comparisons, we demonstrate a relation between the global behaviour of charge radii and the saturation density of nuclear matter, and show that the local charge radii variations, which reflect the many-body polarization effects, naturally emerge from A-body calculations fitted to properties of A ≤ 4 nuclei.
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de Groote, RP, Billowes, J, Binnersley, CL, Bissell, ML, Cocolios, TE et al. 2020. "Measurement and microscopic description of odd–even staggering of charge radii of exotic copper isotopes." Nature Physics, 16 (6).
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