{
  "access": "open",
  "channels": ["ibd"],
  "creators": [
    {
      "kind": "collaboration",
      "name": "STEREO Collaboration"
    }
  ],
  "curation": {
    "added": "2026-10-23",
    "quality_notes": ["metadata from DataCite; physics tags assigned by the curator from title and abstract"],
    "source": "wave 1b: DataCite (collaboration / prefix search)",
    "status": "curated"
  },
  "data": {
    "levels": ["summary", "systematics"],
    "result_of": "10.1088/1361-6471/abd37a"
  },
  "date_published": 2020,
  "description": "These data support the measurement of the $^{235}$U-induced antineutrino spectrum shape by the STEREO experiment. 43 000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equivalent at nominal power. The measured inverse beta decay spectrum is unfolded to provide a pure $^{235}$U spectrum in antineutrino energy. A careful study of the unfolding procedure, including a cross-validation by an independent framework, has shown that no major biases are introduced by the method. A significant local distortion is found with respect to predictions around $E_\\nu = 5.3$ MeV. A gaussian fit of this local excess leads to an amplitude of 12.1 $\\pm$ 3.4% (3.5$\\sigma$).",
  "distributions": [
    {
      "formats": ["yaml", "csv", "json", "root"],
      "host": "hepdata",
      "role": "primary",
      "url": "https://doi.org/10.17182/hepdata.99805.v1"
    }
  ],
  "doi": "10.17182/hepdata.99805.v1",
  "experiments": ["stereo"],
  "id": "hepdata-stereo-u235-spectrum",
  "license": "CC0-1.0",
  "publisher": {
    "kind": "organization",
    "name": "HEPData"
  },
  "references": [
    {
      "doi": "10.1088/1361-6471/abd37a",
      "relation": "describes"
    }
  ],
  "relations": [
    {
      "rel": "is_part_of",
      "target": "hepdata"
    }
  ],
  "short": "HEPData: STEREO first ²³⁵U antineutrino spectrum at ILL",
  "sources": ["reactor"],
  "title": "First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL",
  "topics": ["flux"],
  "type": "dataset",
  "url_landing": "https://www.hepdata.net/record/ins1821378?version=1",
  "version": "1"
}