{
  "abstract": "The structure of $^{22}$C remains unsettled more than a decade after the 2010 reaction-cross-section measurement. The nucleus sits at $N=16$, where the spherical closure of $^{24}$O competes with the deformation of $^{20}$C. We develop a multi-reference density functional approach that restores particle number and angular momentum and mixes quadrupole shapes while retaining the continuum. The calculation gives a deformed two-neutron halo with matter radius of 3.29 fm, closer to the carbon-target extraction, and a long $s$-wave tail. The ground state $0_{1}^{+}$ is dominated by oblate configurations, with $B(E2)$ values comparable to those of $^{20}$C. The valence neutrons occupy mixed $sd$ orbits; the $N=16$ closure established in $^{24}$O is substantially weakened in $^{22}$C.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.39753",
  "author_total": 1,
  "authors": [
    {
      "name": "Xiang-Xiang Sun"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/240kqchyzxv1h.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.39753",
  "fulltext_url": null,
  "id": "240kqchyzxv1h",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.39753",
  "language": null,
  "licence": "CC-BY-SA-4.0",
  "licence_label": "CC BY-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3106|Nuclear physics research studies"
    ]
  ],
  "openalex": "W7215073451",
  "pdf_url": "https://arxiv.org/pdf/2609.39753",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/240kqchyzxv1h.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:49Z",
      "native_id": "2609.39753",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.39753"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Emergence of the nuclear halo in $^{22}$C: Bridging shape and shell",
  "title_text": "Emergence of the nuclear halo in ^22C: Bridging shape and shell",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:49Z",
  "url": "https://research.draconitic.com/paper/240kqchyzxv1h",
  "venue": "arXiv",
  "versions": []
}