{
  "annotation_id": "69a72217-d472-461e-891a-0b3b7ee46b65",
  "date_created": "2026-03-02T18:00:15.411000Z",
  "date_modified": "2026-03-02T18:00:15.411000Z",
  "file_hash": "a1d05395f69a2bb33f486a077eedbbdae21c723fab3874b99afe347f201287b9",
  "private": false,
  "record": {
    "abstract": "A charge-symmetry-breaking nucleon-nucleon force due to the up-down quark\nmass difference is evaluated in the quark cluster model. It is applied to the\nshell-model calculation for the isovector mass shifts of isospin multiplets and\nthe isospin-mixing matrix elements in 1s0d-shell nuclei. We find that the\ncontribution of the quark mass difference effect is large and agrees with\nexperiment. This contribution may explain the Okamoto-Nolen-Schiffer anomaly,\nalternatively to the meson-mixing contribution, which is recently predicted to\nbe reduced by the large off-shell correction.",
    "arxiv_id": "nucl-th/9502013",
    "authors": [
      "S. Nakamura",
      "K. Muto",
      "M. Oka",
      "S. Takeuchi",
      "T. Oda"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevLett.76.881",
    "journal_ref": "Phys.Rev.Lett. 76 (1996) 881-884",
    "title": "Up-Down Quark Mass Difference Effect in Nuclear Many-Body Systems",
    "url": "https://arxiv.org/abs/nucl-th/9502013"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8ba4a399-3865-4894-a557-e7d8f8cacb34",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}