{
  "annotation_id": "9ce56cb6-7421-4018-bd33-cb66cbdb72b3",
  "date_created": "2026-03-02T18:00:25.268000Z",
  "date_modified": "2026-03-02T18:00:25.268000Z",
  "file_hash": "079bb028db4badf6bee93dfb366b080d9cbae8be3880acbd1aff8e070b02215a",
  "private": false,
  "record": {
    "abstract": "Using a self-consistent delta-hole model the pion propagation in isospin\nasymmetric nuclear matter is studied. In neutron-rich matter, corresponding to\nheavy nuclei, a significant difference in positive and negative pion light-cone\ndistributions is obtained leading to a nuclear enhancement of up antiquark\ndistribution compared to the down antiquark one. This means that the sea-quark\nasymmetry in the free nucleon cannot be extracted model independently from an\nexperiment on a neutron-rich nucleus.",
    "arxiv_id": "nucl-th/9812003",
    "authors": [
      "C. L. Korpa",
      "A. E. L. Dieperink"
    ],
    "categories": [
      "nucl-th",
      "hep-ph"
    ],
    "doi": "10.1016/S0370-2693(98)01521-4",
    "journal_ref": "Phys.Lett. B446 (1999) 15-21",
    "title": "Pions in isospin asymmetric matter and nuclear Drell-Yan scattering",
    "url": "https://arxiv.org/abs/nucl-th/9812003"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b89b284d-ae02-4b5d-8d9c-bc17e40f57d6",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}