{
  "annotation_id": "288785ce-fad1-4b54-b29a-8cb27dd96175",
  "date_created": "2026-03-02T18:00:18.735000Z",
  "date_modified": "2026-03-02T18:00:18.735000Z",
  "file_hash": "252d2d573144150bf8d3183954f066251d031aaf3b5c3902c1d2c828bf18f1e5",
  "private": false,
  "record": {
    "abstract": "Coherent $\\eta$ meson photoproduction on $^4$He and $^{12}$C is considered in\nthe near-threshold region. The elementary $\\eta$ photoproduction operator\nincludes contributions from the $S_{11}(1535)$ and $D_{13}(1520)$ resonances as\nwell as $t$-channel vector meson exchange and the nucleon pole terms. Due to\nthe suppression of the dominant $S_{11}(1535)$ resonance for spin and isospin\nsaturated nuclei, the reaction is mainly governed by $\\omega$ exchange.\nFurthermore, the influence of Fermi motion and of different prescriptions for\nthe choice of the invariant reaction energy $W_{\\gamma N}$ in the elementary\namplitude is studied.",
    "arxiv_id": "nucl-th/9703002",
    "authors": [
      "A. Fix",
      "H. Arenhoevel"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/S0375-9474(97)00179-6",
    "journal_ref": "Nucl.Phys. A620 (1997) 457-474",
    "title": "Coherent $\\eta$-photoproduction on $^4$He and $^{12}$C in the   near-threshold region",
    "url": "https://arxiv.org/abs/nucl-th/9703002"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "62e6ced7-dd21-4ec8-b24a-4087d0995a83",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}