{
  "format": "sandboxphysics-reproduction-provenance",
  "formatVersion": 1,
  "package": "frozen-rate-network",
  "createdOn": "2026-11-12",
  "kind": "original standalone Python standard-library model and its saved outputs",
  "testedWith": {"python": "CPython 3.9.6 (macOS)", "thirdPartyPackages": []},
  "inputsTranscribed": [
    {"what": "eleven nuclear rate fits N_A<sigma v>(T9) and their one-sigma fits", "source": "Serpico et al., arXiv:astro-ph/0408076v3 LaTeX source, Appendix E", "file": "serpico_rate_fits.py",
     "notes": "Two printed signs were changed after independent checks; see docs/astronomy/ac74/rate-fit-transcription.md in the site repository."},
    {"what": "atomic mass excesses of n, 1H, 2H, 3H, 3He, 4He, 7Li, 7Be and their ground-state spins", "source": "AME2020 mass_1.mas20.txt, https://www-nds.iaea.org/amdc/ame2020/mass_1.mas20.txt", "file": "nuclear_data.py"},
    {"what": "Born weak-rate integrals", "source": "Pitrou et al., arXiv:1801.08023v3, Eqs. 76-90 (method only; the code is written independently)", "file": "weak_rates.py"}
  ],
  "comparisonOnly": [
    {"what": "PRIMAT Born row", "source": "arXiv:1801.08023v3 Table V"},
    {"what": "abundance tables", "source": "arXiv:astro-ph/0408076v3 Tables 3 and 4"},
    {"what": "logarithmic sensitivities", "source": "Fields et al., arXiv:1912.01132v1 Table II"},
    {"what": "helium per extra neutrino", "source": "PDG 2025 Big-Bang Nucleosynthesis review, Sec. 24.4; CLASS external/bbn/sBBN_2025_primat.dat"}
  ],
  "generated": {
    "frozen-rate-grid.json": "python -B build_frozen_rate_grid.py",
    "expected.json": "python -B replay.py expected.json (first run); later runs compare against it",
    "teaching-values.json": "python -B teaching_values.py teaching-values.json",
    "MANIFEST.json": "python -B write_manifest.py"
  },
  "siteCopy": "src/features/labs/big-bang-light-element-network/data/frozen-rate-grid.json is a byte-identical copy used by the Lab."
}