Charge Radii of Neutron-Rich Scandium Isotopes and the Seniority Symmetry in the 0f7/2 Shell

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Abstract
Nuclear charge radii of neutron-rich Sc 47 – 49 isotopes were measured using collinear laser spectroscopy at CERN-ISOLDE. The new data reveal that the charge radii of scandium isotopes exhibit a distinct trend between N = 20 and N = 28 , with Sc 41 and Sc 49 isotopes having similar values, mirroring the closeness of the charge radii of Ca 40 and Ca 48 . Theoretical models that successfully interpret the radii of calcium isotopes could not account for the observed behavior in scandium radii, in particular the reduced odd-even staggering. Remarkably, the inclusion of the new Sc 49 radius data has unveiled a similar trend in the charge radii of N = 28 isotones and Z = 20 isotopes when adding the protons atop the Ca 48 core and the neutrons atop the Ca 40 core, respectively. We demonstrate that this trend is consistent with the prediction of the seniority model.
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Funding Information
  • National Key Research and Development Program of China (2023YFA1606403, 2022YFA1605100)
  • National Natural Science Foundation of China (12027809, 12305122)
  • Max-Planck-Gesellschaft
  • Bundesministerium für Forschung, Technologie und Raumfahrt (05P18RDCIA, 05P21RDCI1)
  • Fonds Wetenschappelijk Onderzoek (G080022N, GOA 15/010, C1/22/104)
  • KU Leuven
  • Science and Technology Facilities Council (ST/L005794/1, ST/P004423/1, ST/P004598/1)
  • H2020 European Research Council (648381)
  • National Science Foundation (PHY-1068217)
  • U.S. Department of Energy
  • Office of Science
  • Nuclear Physics (DE-SC0013365, DE-SC0023175, DE-SC0021176)
  • Advanced Scientific Computing Research (DE-AC05-00OR22725)
  • Deutsche Forschungsgemeinschaft (279384907—SFB 1245)
  • Helmholtz International Center for FAIR
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Vi.Vidi.192.088)
  • Horizon 2020 Framework Programme (861198, 654002)
  • Research Council of Finland (339243)
  • Natural Sciences and Engineering Research Council of Canada (SAPIN-2018-00027, RGPAS-2018-522453)
  • Japan Science and Technology Agency (JPMJER2304)
  • University of Tsukuba
  • Rijksuniversiteit Groningen
  • New Cornerstone Science Foundation
  • BriX Research (P7/12)

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