{
  "annotation_id": "146d79f2-3d3e-4e23-b17e-f5629ad199dd",
  "date_created": "2026-03-02T18:00:45.891000Z",
  "date_modified": "2026-03-02T18:00:45.891000Z",
  "file_hash": "facea3fe239182999d71e4763309099c797394e40b64c66d4cfb8bd01f8fbcbd",
  "private": false,
  "record": {
    "abstract": "At the \"Domus Galilaeana\" in Pisa, many original documents and records are\nkept, which belong to the scientific activity carried out by Enrico Fermi until\n1938. I compared those documentary sources with the supported evidences, the\npersonal recollections, concerning the discovery that hydrogenated substances\nincrease the radioactivity induced by neutrons: such a comparison leads to the\nconclusion that the discovery occurred on October 20th 1934, i.e., two days\nbefore the date that all the accounts that have been supported so far report.\nThat suggests that any historical study to come, and regarding the experiments\ncarried out by Fermi and his group on neutrons, cannot neglect to analyse\ncarefully the accounts regarding those experiments and to compare them with the\narchive records.",
    "arxiv_id": "physics/0309046",
    "authors": [
      "Alberto De Gregorio"
    ],
    "categories": [
      "physics.hist-ph",
      "nucl-ex",
      "nucl-th"
    ],
    "journal_ref": "Nuovo Saggiatore 19 (2003) 41-47",
    "title": "A Historical Note about how the Property was Discovered that   Hydrogenated Substances Increase the Radioactivity Induced by Neutrons",
    "url": "https://arxiv.org/abs/physics/0309046"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ec517256-3178-4cf5-b319-326f56a444fa",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}