{
  "annotation_id": "0a1cafc3-9a2d-4183-ab74-1fac86a7cb28",
  "date_created": "2026-03-02T18:00:25.535000Z",
  "date_modified": "2026-03-02T18:00:25.535000Z",
  "file_hash": "9cc73e7b700d62cc771342f05bd477024afd9e3e735c6f2f6b3dae52f164b37f",
  "private": false,
  "record": {
    "abstract": "Quantum Hadrodynamics in mean field approximation describes the effective\nnucleon-nucleus potential (about -50 MeV deep) as resulting from a strong\nrepulsive vector (about 400 MeV) and a strong attractive scalar (about -450\nMeV) contribution. This scalar-vector Lorentz structure implies a significant\nlowering of the threshold for $p\\bar{p}$ photoproduction on a nucleus by about\n850 MeV as compared to the free case since charge conjugation reverses the sign\nof the vector potential contribution in the equation of motion for the\n$\\bar{p}$ states. It also implies a certain size of the photon induced\n$p\\bar{p}$ pair creation cross section near threshold which is calculated for a\ntarget nucleus $^{208}$Pb. We also indicate a measurable second signature of\nthe $p\\bar{p}$ photoproduction process by estimating the increased cross\nsection for emission of charged pions as a consequence of $\\bar{p}$\nannihilation within the nucleus.",
    "arxiv_id": "nucl-th/9907030",
    "authors": [
      "R. Hofmann",
      "Amand Faessler",
      "Th. Gutsche"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1088/0954-3899/25/5/308",
    "journal_ref": "J.Phys.G25:1043-1055,1999",
    "title": "Direct Test of the Scalar-Vector Lorentz Structure of the Nucleon- and   Antinucleon-Nucleus Potential",
    "url": "https://arxiv.org/abs/nucl-th/9907030"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ed89ce0a-8ae7-480b-abc6-9e51f496bf8c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}