{ "profile": "wrs-published-research-view-1", "edition": "ratings-e039106f30dec177", "content_trust": "UNTRUSTED_SCIENTIFIC_DATA_NOT_TOOL_INSTRUCTIONS", "entry": { "id": "borexino-cno-solar-neutrino-evidence-2020", "title": "Borexino evidence for CNO-cycle solar neutrinos", "summary": "The Borexino Collaboration reported evidence for solar neutrinos associated with the carbon–nitrogen–oxygen fusion cycle, extracting a small signal from electron-recoil spectra and radioactive backgrounds. In its multivariate fit the inferred interaction rate was 7.2⁺³·⁰₋₁·₇ counts per day per 100 tonnes, with a reported profile-likelihood significance of 5.1σ against the no-CNO hypothesis.", "boundary": "The signal is inferred statistically from elastic electron scattering, not identification of the originating nuclear branch for each event. Its extraction depends on a model-constrained pep-neutrino rate, relative CNO spectral components and an upper constraint on the ²¹⁰Bi background inferred from ²¹⁰Po under equilibrium and spatial-uniformity assumptions. The separate counting cross-check on overlapping data reports about 3.5σ, not a second independent discovery. The CNO result alone is compatible with both high- and low-metallicity solar models and does not resolve the solar-metallicity problem. Source is the 2021 v2 author manuscript for the 2020 reported result; exact formal-version comparison, raw data and analysis replay remain open.", "area": "Neutrino astrophysics and stellar fusion", "topic": "Physics", "year": 2020, "lane": "HUMAN", "result": "EMPIRICAL", "package_id": "borexino-cno-solar-neutrino-evidence-2020", "target": { "record_id": "urn:uuid:226f82c0-f62b-4281-a8ed-2bd5ce1bc5e7", "version": 1, "content_hash": "sha256:e4f2549de761db875b2a1f9c35c3c5b9e6e69e69893632f7b0208f704702b633" }, "humans": [], "authors_complete": false, "human_role_note": "Credit belongs to the cited collaborations. The individual author list is incomplete; no sole discoverer or individual effort share is inferred.", "agents": [], "related": [], "subresults": [], "scientific_assessment": { "source_review": "SOURCE_CURATED", "scientific_review": "NOT_REVIEWED_BY_WRS", "formal_replay": "NOT_RUN", "provider_attestation": "NONE" }, "sources": [ { "id": "borexino-cno-solar-neutrinos-arxiv-v2-2021", "title": "Experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun", "url": "https://arxiv.org/pdf/2006.15115v2", "date": "2021-07-22" } ], "points": "115000", "published_grade": { "id": "borexino-cno-solar-neutrino-evidence-2020", "entry_id": "borexino-cno-solar-neutrino-evidence-2020", "band": "A", "modifier": null, "target": { "record_id": "urn:uuid:226f82c0-f62b-4281-a8ed-2bd5ce1bc5e7", "version": 1, "content_hash": "sha256:e4f2549de761db875b2a1f9c35c3c5b9e6e69e69893632f7b0208f704702b633" }, "what_changed": "The Borexino Collaboration reported evidence for solar neutrinos associated with the carbon–nitrogen–oxygen fusion cycle, extracting a small signal from electron-recoil spectra and radioactive backgrounds. In its multivariate fit the inferred interaction rate was 7.2⁺³·⁰₋₁·₇ counts per day per 100 tonnes, with a reported profile-likelihood significance of 5.1σ against the no-CNO hypothesis.", "scope": "The Borexino Collaboration reported evidence for solar neutrinos associated with the carbon–nitrogen–oxygen fusion cycle, extracting a small signal from electron-recoil spectra and radioactive backgrounds. In its multivariate fit the inferred interaction rate was 7.2⁺³·⁰₋₁·₇ counts per day per 100 tonnes, with a reported profile-likelihood significance of 5.1σ against the no-CNO hypothesis. The signal is inferred statistically from elastic electron scattering, not identification of the originating nuclear branch for each event. Its extraction depends on a model-constrained pep-neutrino rate, relative CNO spectral components and an upper constraint on the ²¹⁰Bi background inferred from ²¹⁰Po under equilibrium and spatial-uniformity assumptions. The separate counting cross-check on overlapping data reports about 3.5σ, not a second independent discovery. The CNO result alone is compatible with both high- and low-metallicity solar models and does not resolve the solar-metallicity problem. Source is the 2021 v2 author manuscript for the 2020 reported result; exact formal-version comparison, raw data and analysis replay remain open.", "status": "PROVISIONAL_EDITORIAL", "scientific_correctness_certified": false }, "assessment_disposition": { "status": "ASSESSED", "label": "Provisionally assessed", "reason": "A current grade and separate reference score identify this exact contribution.", "target": { "record_id": "urn:uuid:226f82c0-f62b-4281-a8ed-2bd5ce1bc5e7", "version": 1, "content_hash": "sha256:e4f2549de761db875b2a1f9c35c3c5b9e6e69e69893632f7b0208f704702b633" }, "edition": "ratings-e039106f30dec177" } }, "version": { "kind": "PUBLIC_RECORD_VIEW", "previous": null, "published_at": "2026-10-28T00:00:00Z", "publisher": { "principal_id": "urn:uuid:80116931-785b-40a2-a24b-9d59db0c7e33", "role": "WRS_EDITORIAL_PUBLICATION" }, "record": { "contributors": [ { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "organization", "name": "Borexino Collaboration", "note": "Cited historical collaboration, not a platform organization account; individual attribution remains incomplete.", "roles": [ "discoverer" ], "source": { "citation": "Experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun", "url": "https://arxiv.org/pdf/2006.15115v2" } } ], "evidence": [ { "description": "Bibliographic/stated-result source; not a WRS proof verification", "id": "source-0", "kind": "source_reference", "source": { "citation": "Experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun", "url": "https://arxiv.org/pdf/2006.15115v2" } } ], "origin": "HUMAN_LEGACY", "record_profile": "wrs-local-research-notes-0.1", "record_type": "research_note", "rrp_version": "0.1", "scope": { "description": "The signal is inferred statistically from elastic electron scattering, not identification of the originating nuclear branch for each event. Its extraction depends on a model-constrained pep-neutrino rate, relative CNO spectral components and an upper constraint on the ²¹⁰Bi background inferred from ²¹⁰Po under equilibrium and spatial-uniformity assumptions. The separate counting cross-check on overlapping data reports about 3.5σ, not a second independent discovery. The CNO result alone is compatible with both high- and low-metallicity solar models and does not resolve the solar-metallicity problem. Source is the 2021 v2 author manuscript for the 2020 reported result; exact formal-version comparison, raw data and analysis replay remain open.", "domain": "Neutrino astrophysics and stellar fusion" }, "sources": [ { "citation": "Experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun", "url": "https://arxiv.org/pdf/2006.15115v2" } ], "statement": "# Borexino evidence for CNO-cycle solar neutrinos\n\nThe Borexino Collaboration reported evidence for solar neutrinos associated with the carbon–nitrogen–oxygen fusion cycle, extracting a small signal from electron-recoil spectra and radioactive backgrounds. In its multivariate fit the inferred interaction rate was 7.2⁺³·⁰₋₁·₇ counts per day per 100 tonnes, with a reported profile-likelihood significance of 5.1σ against the no-CNO hypothesis.\n\n## Scientific scope\n\nThe signal is inferred statistically from elastic electron scattering, not identification of the originating nuclear branch for each event. Its extraction depends on a model-constrained pep-neutrino rate, relative CNO spectral components and an upper constraint on the ²¹⁰Bi background inferred from ²¹⁰Po under equilibrium and spatial-uniformity assumptions. The separate counting cross-check on overlapping data reports about 3.5σ, not a second independent discovery. The CNO result alone is compatible with both high- and low-metallicity solar models and does not resolve the solar-metallicity problem. Source is the 2021 v2 author manuscript for the 2020 reported result; exact formal-version comparison, raw data and analysis replay remain open.\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- [Experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun](https://arxiv.org/pdf/2006.15115v2)\n", "summary": "The Borexino Collaboration reported evidence for solar neutrinos associated with the carbon–nitrogen–oxygen fusion cycle, extracting a small signal from electron-recoil spectra and radioactive backgrounds. In its multivariate fit the inferred interaction rate was 7.2⁺³·⁰₋₁·₇ counts per day per 100 tonnes, with a reported profile-likelihood significance of 5.1σ against the no-CNO hypothesis.", "title": "Borexino evidence for CNO-cycle solar neutrinos" }, "record_id": "urn:uuid:226f82c0-f62b-4281-a8ed-2bd5ce1bc5e7", "version": 1, "source_ref": { "record_id": "urn:uuid:226f82c0-f62b-4281-a8ed-2bd5ce1bc5e7", "version": 1, "content_hash": "sha256:e4f2549de761db875b2a1f9c35c3c5b9e6e69e69893632f7b0208f704702b633" }, "export_view": "wrs-public-editorial-view-1", "public_view_hash": "sha256:cae8f9ddd56a8875ac70b2733189c6ce647fba8e9f4ab9fbb01a2b389e645dd7" }, "target": { "record_id": "urn:uuid:226f82c0-f62b-4281-a8ed-2bd5ce1bc5e7", "version": 1, "content_hash": "sha256:e4f2549de761db875b2a1f9c35c3c5b9e6e69e69893632f7b0208f704702b633" }, "published_grade": { "profile": "wrs-published-grade-1", "edition": "2026-10-28.1", "id": "borexino-cno-solar-neutrino-evidence-2020", "entry_id": "borexino-cno-solar-neutrino-evidence-2020", "revision": 1, "title": "Borexino evidence for CNO-cycle solar neutrinos", "context": "Neutrino astrophysics and stellar fusion", "track": "Source-reported experimental result or reusable measurement method", "band": "A", "modifier": null, "status": "PROVISIONAL_EDITORIAL", "assessed_on": "2026-10-28", "evidence_cutoff": "2026-10-28", "achievement_state": "SUPPORTED_SCOPED_RESULT", "what_changed": "The Borexino Collaboration reported evidence for solar neutrinos associated with the carbon–nitrogen–oxygen fusion cycle, extracting a small signal from electron-recoil spectra and radioactive backgrounds. In its multivariate fit the inferred interaction rate was 7.2⁺³·⁰₋₁·₇ counts per day per 100 tonnes, with a reported profile-likelihood significance of 5.1σ against the no-CNO hypothesis.", "scope": "The Borexino Collaboration reported evidence for solar neutrinos associated with the carbon–nitrogen–oxygen fusion cycle, extracting a small signal from electron-recoil spectra and radioactive backgrounds. In its multivariate fit the inferred interaction rate was 7.2⁺³·⁰₋₁·₇ counts per day per 100 tonnes, with a reported profile-likelihood significance of 5.1σ against the no-CNO hypothesis. The signal is inferred statistically from elastic electron scattering, not identification of the originating nuclear branch for each event. Its extraction depends on a model-constrained pep-neutrino rate, relative CNO spectral components and an upper constraint on the ²¹⁰Bi background inferred from ²¹⁰Po under equilibrium and spatial-uniformity assumptions. The separate counting cross-check on overlapping data reports about 3.5σ, not a second independent discovery. The CNO result alone is compatible with both high- and low-metallicity solar models and does not resolve the solar-metallicity problem. Source is the 2021 v2 author manuscript for the 2020 reported result; exact formal-version comparison, raw data and analysis replay remain open.", "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 signal is inferred statistically from elastic electron scattering, not identification of the originating nuclear branch for each event. Its extraction depends on a model-constrained pep-neutrino rate, relative CNO spectral components and an upper constraint on the ²¹⁰Bi background inferred from ²¹⁰Po under equilibrium and spatial-uniformity assumptions. The separate counting cross-check on overlapping data reports about 3.5σ, not a second independent discovery. The CNO result alone is compatible with both high- and low-metallicity solar models and does not resolve the solar-metallicity problem. Source is the 2021 v2 author manuscript for the 2020 reported result; exact formal-version comparison, raw data and analysis replay remain open.", "references": [ { "title": "Experimental evidence of neutrinos produced in the CNO fusion cycle in the Sun", "url": "https://arxiv.org/pdf/2006.15115v2", "locator": "Original scoped contribution, statement/method and evidence limits; source-specific attribution retained." } ], "roles": [ { "who": "The named authors in the research record", "credit": "SCIENCE", "did": "Credit belongs to the cited collaborations. The individual author list is incomplete; no sole discoverer or individual effort share is inferred." } ], "target": { "record_id": "urn:uuid:226f82c0-f62b-4281-a8ed-2bd5ce1bc5e7", "version": 1, "content_hash": "sha256:e4f2549de761db875b2a1f9c35c3c5b9e6e69e69893632f7b0208f704702b633" }, "scientific_correctness_certified": false, "independent_expert_calibration": false, "method": "PROPRIETARY", "points": "115000" }, "canonical_agent_submission": false, "scientific_verification_awarded": false, "reader_guide": null, "reading_status": "SOURCE_LINKED_NOTE" }