{
  "annotation_id": "1d43ee05-180c-4838-91f5-ec4b8491893f",
  "date_created": "2026-03-02T18:00:18.289000Z",
  "date_modified": "2026-03-02T18:00:18.289000Z",
  "file_hash": "9a086396cbe585aecad5ffd65efa56eef797de931fbeb517c09a1b87bb3683a2",
  "private": false,
  "record": {
    "abstract": "We study the first excited state of He4 in a microscopic {H3+p,He3+n} cluster\nmodel, including H3 and He3 distortions. The phenomenological 1S0 H3+p\nscattering phase shift is well reproduced. We localize a complex pole of the\nS-matrix between the H3+p and He3+n thresholds. The corresponding resonance\nparameters are E_r=93 keV position relative to H3+p, and Gamma=390 keV width. A\npole search is also performed in an extended R-matrix method, and a resonance\nis found with parameters E_r=114 keV and Gamma=392 keV. The R-matrix approach\ngives several additional poles, some of which may be connected with an enhanced\nthreshold effect.",
    "arxiv_id": "nucl-th/9701006",
    "authors": [
      "Attila Csoto",
      "G. M. Hale"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.55.2366",
    "journal_ref": "Phys.Rev.C55:2366-2372,1997",
    "title": "Nature of the first excited state of He-4",
    "url": "https://arxiv.org/abs/nucl-th/9701006"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "57ae55e4-0610-46e7-80a4-837cbfbfa6f6",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}