{
  "annotation_id": "70645a98-31a3-49a1-873c-a03e8ea274b2",
  "date_created": "2026-03-02T18:00:18.344000Z",
  "date_modified": "2026-03-02T18:00:18.344000Z",
  "file_hash": "ed25511d966638f55705e66fb25d10c6d461c06084ee22d07e6b0fa768bc0b69",
  "private": false,
  "record": {
    "abstract": "We investigate the BCS treatment of neutron-proton pairing involving\ntime-reversed orbits. We conclude that an isospin-symmetric hamiltonian,\ntreated with the help of the generalized Bogolyubov transformation, fails to\ndescribe the ground state pairing properties correctly. In order for the np\nisovector pairs to coexist with the like-particle pairs, one has to break the\nisospin symmetry of the hamiltonian by artificially increasing the strength of\nnp pairing interaction above its isospin symmetric value. We conjecture that\nthe np isovector pairing represents part (or most) of the congruence energy\n(Wigner term) in nuclear masses.",
    "arxiv_id": "nucl-th/9702047",
    "authors": [
      "O. Civitarese",
      "M. Reboiro",
      "P. Vogel"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.56.1840",
    "journal_ref": "Phys.Rev.C56:1840-1843,1997",
    "title": "Neutron-proton pairing in the BCS approach",
    "url": "https://arxiv.org/abs/nucl-th/9702047"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ae4c1522-36ce-46c2-98d8-a047453c18cc",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}