{
  "abstract": "We construct semiclassical 3D models based on $\\textit{ab initio}$ no-core shell model calculated two-body spatial correlations, which represent the preferred spatial configuration of nucleons for the ground state of $^6$He. We demonstrate that the presence of the two valence neutrons distorts and flattens the $α$ core in $^6$He, marking a clear departure from the tetrahedral configuration of free $^4$He, and that the two valence neutrons and the center of mass of the $α$ cluster ($α$-CM) are roughly located at the three distinct vertices of an equilateral triangle. We compute the geometric parameters that commonly characterize $^6$He structure, 1) $θ_{nn}$, the opening angle of the two valence neutrons with respect to $α$-CM, and 2) $r_{nn}$, the root-mean-square separation between the two valence neutrons. Refining the model with uncertainty estimation, we obtain $θ_{nn}= 58.5^{+5.4}_{-6.2}$ degrees and $r_{nn}= 4.12^{+0.37}_{-0.43}$ fm, agreeing with those calculated via a phenomenologically modified continuum-discretized coupled-channels method, while an interferometry experiment obtained a marginally higher $r_{nn}$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22365",
  "author_total": 4,
  "authors": [
    {
      "name": "Mengyao Huang"
    },
    {
      "name": "Tobias Frederico"
    },
    {
      "name": "Peng Yin"
    },
    {
      "name": "James P. Vary"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b4a23cb6hh06n.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22365",
  "fulltext_url": null,
  "id": "b4a23cb6hh06n",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22365",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3106|Nuclear physics research studies"
    ]
  ],
  "openalex": "W7222425346",
  "pdf_url": "https://arxiv.org/pdf/2610.22365",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/b4a23cb6hh06n.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.22365",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22365"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "$^6$He structure from semiclassical 3D models based on $\\textit{ab initio}$ spatial correlations",
  "title_text": "^6He structure from semiclassical 3D models based on ab initio spatial correlations",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/b4a23cb6hh06n",
  "venue": "arXiv",
  "versions": []
}