{
  "annotation_id": "b5292ce9-d620-46f2-985c-48f1b82ca669",
  "date_created": "2026-03-02T18:00:25.831000Z",
  "date_modified": "2026-03-02T18:00:25.831000Z",
  "file_hash": "bca3a322de8fcf44e9b0284e7b98d5aed7fccd6c3a3356a66383dac6a413548b",
  "private": false,
  "record": {
    "abstract": "The long standing problem of proton-neutron pairing and, in particular, the\nlimitations imposed on the solutions by the available symmetries, is revisited.\nWe look for solutions with non-vanishing expectation values of the proton, the\nneutron and the isoscalar gaps. For an equal number of protons and neutrons we\nfind two solutions where the absolute values of proton and neutrons gaps are\nequal but have the same or opposite sign. The behavior and structure of these\nsolutions differ for spin saturated (single l-shell) and spin unsaturared\nsystems (single j-shell). In the former case the BCS results are checked\nagainst an exact calculation.",
    "arxiv_id": "nucl-th/9907007",
    "authors": [
      "D. R. Bes",
      "O. Civitarese",
      "E. E. Maqueda",
      "N. N. Scoccola"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.61.024315",
    "journal_ref": "Phys.Rev. C61 (2000) 024315",
    "title": "Structure of the vacuum states in the presence of isovector and   isoscalar pairing correlations",
    "url": "https://arxiv.org/abs/nucl-th/9907007"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "56ea765e-f9f6-47e5-8dda-4060c2ea45fb",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}