{
  "annotation_id": "cd98503e-e858-41a1-a097-5d8639c3c3d1",
  "date_created": "2026-03-02T18:00:15.559000Z",
  "date_modified": "2026-03-02T18:00:15.559000Z",
  "file_hash": "b7cfc7cb4e6e6442705b7887fe2cf3ecc4914aae93dd3bbcb781865f467fc7f3",
  "private": false,
  "record": {
    "abstract": "The relativistic amplitude for the direct knock-out contribution to $\\left(\n\\gamma, p \\right)$ reactions on nuclei is reduced to a nonrelativistic form\nusing an effective Pauli reduction scheme. The reduction is carried out to\nsecond order in the inverse nucleon mass. It is found that the interaction\nHamiltonian appearing in the nonrelativistic amplitude has significant\ndependence, starting at second order, on the vector and scalar mean nuclear\npotentials. These strong medium modifications are absent in traditional\nnonrelativistic calculations. Detailed comparisons show that these\nmodifications are crucial to understanding the differences between relativistic\nand nonrelativistic models. These differences are also examined through\nreduction of the relativistic amplitude via the Foldy-Wouthuysen\ntransformation. Similar medium modifications are obtained in this case as well.\nWe discuss the implications of these medium modifications for the consistency\nof existing nonrelativistic calculations.",
    "arxiv_id": "nucl-th/9507021",
    "authors": [
      "M. Hedayati-Poor",
      "J. I. Johansson",
      "H. S. Sherif"
    ],
    "categories": [
      "nucl-th",
      "hep-ph"
    ],
    "doi": "10.1016/0375-9474(95)00329-Y",
    "journal_ref": "Nucl.Phys. A593 (1995) 377-398",
    "title": "Relativistic Calculations for Photonuclear Reactions (II).   Nonrelativistic reductions and nuclear medium effects",
    "url": "https://arxiv.org/abs/nucl-th/9507021"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "719e01be-0927-4929-b1c7-751ade53bd0e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}