A1 Journal article (refereed)
Measurement and microscopic description of odd-even staggering of charge radii of exotic copper isotopes (2020)

de Groote, R. P., Billowes, J., Binnersley, C. L., Bissell, M. L., Cocolios, T. E., Day Goodacre, T., Farooq-Smith, G. J., Fedorov, D. V., Flanagan, K. T., Franchoo, S., Garcia Ruiz, R. F., Gins, W., Holt, J. D., Koszorús, Á., Lynch, K. M., Miyagi, T., Nazarewicz, W., Neyens, G., Reinhard, P.-G., . . . Yang, X. F. (2020). Measurement and microscopic description of odd-even staggering of charge radii of exotic copper isotopes. Nature Physics, 16(6), 620-624. https://doi.org/10.1038/s41567-020-0868-y

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Publication details

All authors or editors: de Groote, R. P.; Billowes, J.; Binnersley, C. L.; Bissell, M. L.; Cocolios, T. E.; Day Goodacre, T.; Farooq-Smith, G. J.; Fedorov, D. V.; Flanagan, K. T.; Franchoo, S.; et al.

Journal or series: Nature Physics

ISSN: 1745-2473

eISSN: 1745-2481

Publication year: 2020

Volume: 16

Issue number: 6

Pages range: 620-624

Publisher: Nature Publishing Group

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1038/s41567-020-0868-y

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published: https://arxiv.org/abs/1911.08765


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 theory2,3,4. 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.

Keywords: nuclear physics; isotopes; copper

Free keywords: experimental nuclear physics; theoretical nuclear physics

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Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 3

Last updated on 2021-07-07 at 21:34