{
  "abstract": "The charge radii of calcium isotopes are investigated within the framework of relativistic configuration-interaction density functional (ReCD) theory. The ReCD theory microscopically incorporates beyond-mean-field correlations through rotational symmetry restoration and configuration mixing among quasiparticle excited states, and treats even-even and odd-$A$ isotopes on the same footing. It is found that beyond-mean-field correlations significantly soften the potential energy surfaces of calcium isotopes and shift the energy minima from nearly spherical mean-field solutions to deformed shapes. The quadrupole deformation parameters predicted by the ReCD theory show much better agreement with the available experimental data than the mean-field results, supporting the reliability of the calculated potential energy surfaces and highlighting the important role of beyond-mean-field correlations. Owing to the sensitive dependence of charge radii on nuclear deformation, the charge radii obtained within the ReCD framework are generally larger than the mean-field predictions. The nearly identical charge radii of $^{40}\\mathrm{Ca}$ and $^{48}\\mathrm{Ca}$, as well as the unexpectedly large charge radius of $^{52}\\mathrm{Ca}$, are well reproduced. Compared with the mean-field calculations, the description of the odd-even staggering is improved, especially for the enhanced charge radii of $^{42}\\mathrm{Ca}$ and $^{44}\\mathrm{Ca}$. It is also worth noting that secondary local minima appear in the ReCD-based potential energy surfaces of the odd-$A$ calcium isotopes $^{41,43,47}\\mathrm{Ca}$. The present results suggest that shape mixing between different local minima, which is not fully included in the present calculation, may further improve the description of the pronounced odd-even staggering observed in calcium isotopes.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Chin. Phys. C 50, 114107 (2026)",
  "arxiv": "2607.08478",
  "author_total": 3,
  "authors": [
    {
      "name": "Teng Qu"
    },
    {
      "name": "Bo Li"
    },
    {
      "name": "Yakun Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cmdhk2vm728k8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.08478",
  "fulltext_url": null,
  "id": "cmdhk2vm728k8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.08478",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2607.08478",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cmdhk2vm728k8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2607.08478",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.08478"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Charge radii of calcium isotopes within relativistic configuration-interaction density functional theory",
  "title_text": "Charge radii of calcium isotopes within relativistic configuration-interaction density functional theory",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/cmdhk2vm728k8",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1088/1674-1137/ae9917",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}