{
  "annotation_id": "464f08c7-4af8-4d4b-8eab-642ca0812c39",
  "date_created": "2026-03-02T18:00:18.842000Z",
  "date_modified": "2026-03-02T18:00:18.842000Z",
  "file_hash": "b51a5427700c33cbb8aa0eb577e307e15bffeb062a29017917e54acb61cba047",
  "private": false,
  "record": {
    "abstract": "We study coherent eta-photoproduction from nuclei in a relativistic impulse\napproximation approach. For the elementary production amplitude we use a\nstandard relativistic parameterization based on a set of four Lorentz- and\ngauge-invariant amplitudes. The photonuclear amplitude is evaluated without\nrecourse to a nonrelativistic reduction; the full relativistic structure of the\namplitude is maintained. On general arguments we show that the coherent process\nis sensitive to only one of the elementary amplitudes. Moreover, we show that\nthe nuclear structure information is fully contained in the ground-state tensor\ndensity. The tensor density is evaluated in a mean-field approximation to the\nWalecka model and it is shown to be sensitive to relativistic effects.\nDistortion effects are incorporated through an eta-nucleus optical potential\nthat is computed in a simple t-rho approximation.",
    "arxiv_id": "nucl-th/9701019",
    "authors": [
      "J. Piekarewicz",
      "A. J. Sarty",
      "M. Benmerrouche"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.55.2571",
    "journal_ref": "Phys.Rev.C55:2571-2576,1997",
    "title": "Coherent eta-photoproduction from nuclei in a relativistic impulse   approximation approach",
    "url": "https://arxiv.org/abs/nucl-th/9701019"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e04c5695-761f-4a38-a9d0-71309fe9f6b8",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}