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    "title": "SNO neutral-current evidence for solar neutrino flavor transformation",
    "summary": "Using heavy water, the SNO Collaboration separated charged-current, neutral-current and elastic-scattering contributions from solar boron-8 neutrinos. Assuming the standard boron-8 spectrum, it inferred a non-electron active-neutrino flux of 3.41 × 10⁶ cm⁻² s⁻¹, reported as 5.3σ above zero, providing strong evidence for flavor transformation.",
    "boundary": "The result uses 306.4 live days from the pure heavy-water phase, a 5 MeV reconstructed electron-energy threshold, Monte Carlo response models and measured radioactive backgrounds. The 5.3σ result assumes the standard boron-8 spectral shape; the spectrum-unconstrained neutral-current flux has a larger uncertainty. The neutral-current signal measures total active flavors, without separately resolving muon and tau neutrinos. Adding Super-Kamiokande data changes the reported significance and is not the standalone SNO result.",
    "area": "Neutrino astrophysics",
    "topic": "Physics",
    "year": 2002,
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    "related": [],
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      "scientific_review": "NOT_REVIEWED_BY_WRS",
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        "id": "sno-neutral-current-solar-neutrino-arxiv-v2-2002",
        "title": "Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory",
        "url": "https://arxiv.org/pdf/nucl-ex/0204008v2",
        "date": "2002-05-09"
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      "id": "sno-neutral-current-solar-neutrino-flavour-transformation-2002",
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      "scope": "Using heavy water, the SNO Collaboration separated charged-current, neutral-current and elastic-scattering contributions from solar boron-8 neutrinos. Assuming the standard boron-8 spectrum, it inferred a non-electron active-neutrino flux of 3.41 × 10⁶ cm⁻² s⁻¹, reported as 5.3σ above zero, providing strong evidence for flavor transformation. The result uses 306.4 live days from the pure heavy-water phase, a 5 MeV reconstructed electron-energy threshold, Monte Carlo response models and measured radioactive backgrounds. The 5.3σ result assumes the standard boron-8 spectral shape; the spectrum-unconstrained neutral-current flux has a larger uncertainty. The neutral-current signal measures total active flavors, without separately resolving muon and tau neutrinos. Adding Super-Kamiokande data changes the reported significance and is not the standalone SNO result.",
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          "credit": "historical_scientific",
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          "name": "SNO Collaboration",
          "note": "Cited historical collaboration, not a platform organization account; individual attribution remains incomplete.",
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            "citation": "Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory",
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          "source": {
            "citation": "Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory",
            "url": "https://arxiv.org/pdf/nucl-ex/0204008v2"
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      "scope": {
        "description": "The result uses 306.4 live days from the pure heavy-water phase, a 5 MeV reconstructed electron-energy threshold, Monte Carlo response models and measured radioactive backgrounds. The 5.3σ result assumes the standard boron-8 spectral shape; the spectrum-unconstrained neutral-current flux has a larger uncertainty. The neutral-current signal measures total active flavors, without separately resolving muon and tau neutrinos. Adding Super-Kamiokande data changes the reported significance and is not the standalone SNO result.",
        "domain": "Neutrino astrophysics"
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      "sources": [
        {
          "citation": "Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory",
          "url": "https://arxiv.org/pdf/nucl-ex/0204008v2"
        }
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      "statement": "# SNO neutral-current evidence for solar neutrino flavor transformation\n\nUsing heavy water, the SNO Collaboration separated charged-current, neutral-current and elastic-scattering contributions from solar boron-8 neutrinos. Assuming the standard boron-8 spectrum, it inferred a non-electron active-neutrino flux of 3.41 × 10⁶ cm⁻² s⁻¹, reported as 5.3σ above zero, providing strong evidence for flavor transformation.\n\n## Scientific scope\n\nThe result uses 306.4 live days from the pure heavy-water phase, a 5 MeV reconstructed electron-energy threshold, Monte Carlo response models and measured radioactive backgrounds. The 5.3σ result assumes the standard boron-8 spectral shape; the spectrum-unconstrained neutral-current flux has a larger uncertainty. The neutral-current signal measures total active flavors, without separately resolving muon and tau neutrinos. Adding Super-Kamiokande data changes the reported significance and is not the standalone SNO result.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\n\n\nCredit belongs to the cited collaborations. The individual author list is incomplete; no sole discoverer or individual effort share is inferred.\n\n\n\n## Original sources\n\n- [Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory](https://arxiv.org/pdf/nucl-ex/0204008v2)\n",
      "summary": "Using heavy water, the SNO Collaboration separated charged-current, neutral-current and elastic-scattering contributions from solar boron-8 neutrinos. Assuming the standard boron-8 spectrum, it inferred a non-electron active-neutrino flux of 3.41 × 10⁶ cm⁻² s⁻¹, reported as 5.3σ above zero, providing strong evidence for flavor transformation.",
      "title": "SNO neutral-current evidence for solar neutrino flavor transformation"
    },
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    "edition": "2026-10-28.1",
    "id": "sno-neutral-current-solar-neutrino-flavour-transformation-2002",
    "entry_id": "sno-neutral-current-solar-neutrino-flavour-transformation-2002",
    "revision": 1,
    "title": "SNO neutral-current evidence for solar neutrino flavor transformation",
    "context": "Neutrino astrophysics",
    "track": "Source-reported experimental result or reusable measurement method",
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    "assessed_on": "2026-10-28",
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    "achievement_state": "SUPPORTED_SCOPED_RESULT",
    "what_changed": "Using heavy water, the SNO Collaboration separated charged-current, neutral-current and elastic-scattering contributions from solar boron-8 neutrinos. Assuming the standard boron-8 spectrum, it inferred a non-electron active-neutrino flux of 3.41 × 10⁶ cm⁻² s⁻¹, reported as 5.3σ above zero, providing strong evidence for flavor transformation.",
    "scope": "Using heavy water, the SNO Collaboration separated charged-current, neutral-current and elastic-scattering contributions from solar boron-8 neutrinos. Assuming the standard boron-8 spectrum, it inferred a non-electron active-neutrino flux of 3.41 × 10⁶ cm⁻² s⁻¹, reported as 5.3σ above zero, providing strong evidence for flavor transformation. The result uses 306.4 live days from the pure heavy-water phase, a 5 MeV reconstructed electron-energy threshold, Monte Carlo response models and measured radioactive backgrounds. The 5.3σ result assumes the standard boron-8 spectral shape; the spectrum-unconstrained neutral-current flux has a larger uncertainty. The neutral-current signal measures total active flavors, without separately resolving muon and tau neutrinos. Adding Super-Kamiokande data changes the reported significance and is not the standalone SNO result.",
    "evidence_summary": "The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The result uses 306.4 live days from the pure heavy-water phase, a 5 MeV reconstructed electron-energy threshold, Monte Carlo response models and measured radioactive backgrounds. The 5.3σ result assumes the standard boron-8 spectral shape; the spectrum-unconstrained neutral-current flux has a larger uncertainty. The neutral-current signal measures total active flavors, without separately resolving muon and tau neutrinos. Adding Super-Kamiokande data changes the reported significance and is not the standalone SNO result.",
    "references": [
      {
        "title": "Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory",
        "url": "https://arxiv.org/pdf/nucl-ex/0204008v2",
        "locator": "Original scoped contribution, statement/method and evidence limits; source-specific attribution retained."
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        "did": "Credit belongs to the cited collaborations. The individual author list is incomplete; no sole discoverer or individual effort share is inferred."
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