{
  "annotation_id": "5d363be6-3e64-40d5-8a83-f9461c01d326",
  "date_created": "2026-03-02T18:00:17.992000Z",
  "date_modified": "2026-03-02T18:00:17.992000Z",
  "file_hash": "48a28dbdc6e28549dacdd572109c8981bd41ca0dbfcf184fe663d0b6523e6392",
  "private": false,
  "record": {
    "abstract": "The direct excitation of a \"sea\" of two-phonon configurations above 15 MeV\nfrom the ground state is considered. It is concluded that these configurations\nform a flat physical background in photoexcitation cross sections and Coulomb\nexcitation in heavy ion reactions at relativistic energies. The contribution of\nthe background to the total cross section in Coulomb excitation of Pb-208 in\nthe DGDR energy region is about 15%. This shows that It should be considered\nwhile drawing out conclusions on anharmonicities effects for the DGDR.",
    "arxiv_id": "nucl-th/9706066",
    "authors": [
      "V. Yu. Ponomarev",
      "C. A. Bertulani"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevLett.79.3853",
    "journal_ref": "Phys.Rev.Lett.79:3853-3856,1997",
    "title": "Two-phonon background for the double giant resonance",
    "url": "https://arxiv.org/abs/nucl-th/9706066"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "40ac0a9e-9891-4cb7-a339-c4302171c6e1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}