{
  "annotation_id": "b4532c88-afb5-4310-8580-597f07c4bd90",
  "date_created": "2026-03-02T18:00:08.376000Z",
  "date_modified": "2026-03-02T18:00:08.376000Z",
  "file_hash": "e8d2ec4e2b94cb2341607e4d8287ed3dee2e8864d2a10fde3f17a51367c3de12",
  "private": false,
  "record": {
    "abstract": "The cross section for the dd -\u003e 4He pi pi reaction is estimated near\nthreshold in a two-step model where a pion created in a first interaction\nproduces a second pion in a subsequent interaction. This approach, which\ndescribes well the rates of 2pi and eta production in the pd -\u003e 3He pi pi and\ndd -\u003e 4He eta reactions, leads to predictions that are much too low compared to\nexperiment. Alternatives to this and the double-Delta model will have to be\nsought to explain these data.",
    "arxiv_id": "nucl-th/0604017",
    "authors": [
      "Goran Faldt",
      "Ulla Tengblad",
      "Colin Wilkin"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1140/epja/i2006-10051-7",
    "journal_ref": "Eur.Phys.J. A28 (2006) 245-249",
    "title": "Two-pion production in deuteron-deuteron collisions at low energies",
    "url": "https://arxiv.org/abs/nucl-th/0604017"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "17daf0b4-98a8-49b6-a562-87f1abcce0c6",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}