{
  "datasetVersion": "fr07-spectroscopy-2026-10-27",
  "kind": "small-numerical-excerpt-of-evaluated-nuclear-data",
  "energyUnit": "keV",
  "uncertaintyConvention": "Quoted absolute energy uncertainties, not fit errors; ground-state energy is the excitation-energy reference.",
  "sources": [
    {
      "id": "ensdf-er166-2008", "nuclide": "166Er",
      "url": "https://www.nndc.bnl.gov/ensnds/166/Er/adopted.pdf",
      "evaluation": "Coral M. Baglin, Nuclear Data Sheets 109, 1103 (2008), literature cutoff 2008-03-01",
      "location": "Adopted Levels, Gammas, pages 1–2; ground-state band marked b",
      "retrieved": "2026-10-27",
      "retrievedPdfSha256": "d3ec346c07ff68f8a708779310c7f26d4a65bea029e158b9e25c4e962a2f2c4e",
      "licence": "Source supplied publicly by NNDC; no blanket redistribution licence asserted. Only a short numerical factual excerpt is reproduced, with attribution; the full publication is linked.",
      "originalEnergyUnit": "keV", "originalUncertaintyFormat": "last quoted digits",
      "originalRows": ["0.0  0+", "80.5776 20  2+", "264.990 3  4+", "545.454 4  6+", "911.208 6  8+"]
    },
    {
      "id": "tunl-o17-1993", "nuclide": "17O",
      "url": "https://nucldata.tunl.duke.edu/nucldata/HTML/A%3D17/17_10_1993.pdf",
      "evaluation": "D. R. Tilley, H. R. Weller and C. M. Cheves, Nuclear Physics A564, 1 (1993), 1993TI07",
      "location": "Table 17.10, Energy levels of 17O, page 1",
      "retrieved": "2026-10-27",
      "licence": "Public TUNL evaluated table; no blanket redistribution licence asserted. Only three numerical facts are excerpted; the full table is linked.",
      "originalEnergyUnit": "MeV", "originalUncertaintyUnit": "keV",
      "originalRows": ["0  5/2+", "0.87073 ±0.10  1/2+", "5.0848 ±0.9  3/2+; width 96 ±5 keV; gamma, neutron decay"]
    }
  ],
  "nuclides": [
    {"id":"er166","label":"166Er","sourceId":"ensdf-er166-2008","levels":[
      {"spin":0,"parity":1,"energyKeV":0,"uncertaintyKeV":0,"role":"reference"},
      {"spin":2,"parity":1,"energyKeV":80.5776,"uncertaintyKeV":0.0020,"role":"calibration"},
      {"spin":4,"parity":1,"energyKeV":264.990,"uncertaintyKeV":0.003,"role":"comparison"},
      {"spin":6,"parity":1,"energyKeV":545.454,"uncertaintyKeV":0.004,"role":"comparison"},
      {"spin":8,"parity":1,"energyKeV":911.208,"uncertaintyKeV":0.006,"role":"comparison"}
    ]},
    {"id":"o17","label":"17O","sourceId":"tunl-o17-1993","levels":[
      {"spin":2.5,"parity":1,"orbitalL":2,"energyKeV":0,"uncertaintyKeV":0,"role":"reference"},
      {"spin":0.5,"parity":1,"orbitalL":0,"energyKeV":870.73,"uncertaintyKeV":0.10,"role":"comparison"},
      {"spin":1.5,"parity":1,"orbitalL":2,"energyKeV":5084.8,"uncertaintyKeV":0.9,"widthKeV":96,"widthUncertaintyKeV":5,"role":"calibration"}
    ]}
  ]
}