Measurement and microscopic description of odd–even staggering of charge radii of exotic copper isotopes

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.; Rothe, S.; Stroke, H. H.; Vernon, A. R.; Wendt, K. D.  A.; Wilkins, S. G.; Xu, Z. Y.; Yang, X. F.

doi:10.1038/s41567-020-0868-y

Title: Measurement and microscopic description of odd–even staggering of charge radii of exotic copper isotopes

Journal Article · 13 April 2020 · Nature Physics

DOI: https://doi.org/10.1038/s41567-020-0868-y · OSTI ID:1615730

^[1]; Billowes, J. ^[2]; Binnersley, C. L. ^[2]; Bissell, M. L. ^[2];

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^[5]; Flanagan, K. T. ^[2]; Franchoo, S. ^[6]; Garcia Ruiz, R. F. ^[7]; Gins, W. ^[1];

^[8]; Koszorús, Á. ^[3]; Lynch, K. M. ^[9]; Miyagi, T. ^[10];

^[11]; Neyens, G. ^[12]; Reinhard, P. -G. ^[13];

^[14] more »

Katholieke Univ. (KU), Leuven (Belgium); Univ. of Jyvaskyla (Finland)
Univ. of Manchester (United Kingdom)
Katholieke Univ. (KU), Leuven (Belgium)
European Organization for Nuclear Research (CERN), Geneva (Switzerland); TRIUMF, Vancouver, BC (Canada)
Petersburg Nuclear Physics Inst., Gatchina (Russia)
Inst. of Nuclear Physics (IPN), Orsay (France)
Univ. of Manchester (United Kingdom); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
TRIUMF, Vancouver, BC (Canada); McGill Univ., Montreal, QC (Canada)
European Organization for Nuclear Research (CERN), Geneva (Switzerland)
TRIUMF, Vancouver, BC (Canada)
Michigan State Univ., East Lansing, MI (United States)
Katholieke Univ. (KU), Leuven (Belgium); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Univ. Erlangen (Germany)
Univ. of Manchester (United Kingdom); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
New York Univ. (NYU), NY (United States)
Katholieke Univ. (KU), Leuven (Belgium); Univ. of Manchester (United Kingdom)
Johannes Gutenberg-Univ., Mainz (Germany)
Katholieke Univ. (KU), Leuven (Belgium); Peking Univ., Beijing (China)

Nuclear charge radii globally scale with atomic mass number A as A^1/3, 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 theory. 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 theory and A-body valence-space in-medium similarity renormalization group theory. 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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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); FNPMLS ERC Consolidator; Science and Technology Facilities Council; National Research Council of Canada

Grant/Contract Number:: SC0013365; SC0008511; SC)0018083; 648381; ST/P004423/1; ST/L005794/1

OSTI ID:: 1615730

Journal Information:: Nature Physics, Vol. 16; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 62 works

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