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

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [5];  [2];  [6];  [7];  [1]; ORCiD logo [8];  [3];  [9];  [10]; ORCiD logo [11];  [12];  [13]; ORCiD logo [14] more »;  [15];  [16];  [17]; ORCiD logo [14];  [3]; ORCiD logo [18] « less
  1. Katholieke Univ. (KU), Leuven (Belgium); Univ. of Jyvaskyla (Finland)
  2. Univ. of Manchester (United Kingdom)
  3. Katholieke Univ. (KU), Leuven (Belgium)
  4. European Organization for Nuclear Research (CERN), Geneva (Switzerland); TRIUMF, Vancouver, BC (Canada)
  5. Petersburg Nuclear Physics Inst., Gatchina (Russia)
  6. Inst. of Nuclear Physics (IPN), Orsay (France)
  7. Univ. of Manchester (United Kingdom); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  8. TRIUMF, Vancouver, BC (Canada); McGill Univ., Montreal, QC (Canada)
  9. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  10. TRIUMF, Vancouver, BC (Canada)
  11. Michigan State Univ., East Lansing, MI (United States)
  12. Katholieke Univ. (KU), Leuven (Belgium); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  13. Univ. Erlangen (Germany)
  14. Univ. of Manchester (United Kingdom); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  15. New York Univ. (NYU), NY (United States)
  16. Katholieke Univ. (KU), Leuven (Belgium); Univ. of Manchester (United Kingdom)
  17. Johannes Gutenberg-Univ., Mainz (Germany)
  18. Katholieke Univ. (KU), Leuven (Belgium); Peking Univ., Beijing (China)
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); FNPMLS ERC Consolidator; Science and Technology Facilities Council; National Research Council of Canada
OSTI Identifier:
1615730
Grant/Contract Number:  
SC0013365; SC0008511; SC)0018083; 648381; ST/P004423/1; ST/L005794/1
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Name: Nature Physics; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
experimental nuclear physics; theoretical nuclear physics

Citation Formats

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., and Yang, X. F. Measurement and microscopic description of odd–even staggering of charge radii of exotic copper isotopes. United States: N. p., 2020. Web. doi:10.1038/s41567-020-0868-y.
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. Measurement and microscopic description of odd–even staggering of charge radii of exotic copper isotopes. United States. doi:10.1038/s41567-020-0868-y.
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., and Yang, X. F. Mon . "Measurement and microscopic description of odd–even staggering of charge radii of exotic copper isotopes". United States. doi:10.1038/s41567-020-0868-y. https://www.osti.gov/servlets/purl/1615730.
@article{osti_1615730,
title = {Measurement and microscopic description of odd–even staggering of charge radii of exotic copper isotopes},
author = {de Groote, R. P. and Billowes, J. and Binnersley, C. L. and Bissell, M. L. and Cocolios, T. E. and Day Goodacre, T. and Farooq-Smith, G. J. and Fedorov, D. V. and Flanagan, K. T. and Franchoo, S. and Garcia Ruiz, R. F. and Gins, W. and Holt, J. D. and Koszorús, Á. and Lynch, K. M. and Miyagi, T. and Nazarewicz, W. and Neyens, G. and Reinhard, P. -G. and Rothe, S. and Stroke, H. H. and Vernon, A. R. and Wendt, K. D. A. and Wilkins, S. G. and Xu, Z. Y. and Yang, X. F.},
abstractNote = {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 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.},
doi = {10.1038/s41567-020-0868-y},
journal = {Nature Physics},
issn = {1745-2473},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {4}
}

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