{ "story_id": "638ed3c55974e1ca0d509188b8c6f5bd", "desk": "drm3", "revision": 1, "published_at": "2026-09-02T11:09:13.000Z", "content_hash": "1252bcc2f9f1d5c05568f8e9f260e66f5030ed993c566da39aa3e2b6e1e154b1", "hash_basis": "sha256 over `headline\\ndek\\nprose`, plus `\\n` + the canonical citations JSON when any source is placed, plus `\\n#blog` for blogs", "basis": { "headline": "XENONnT Detector Achieves First Measurement of Low-Energy Solar Neutrinos", "dek": "Researchers using the XENONnT detector observed the first scattering of low-energy solar neutrinos off electrons.", "prose": "Researchers in the XENON Collaboration announced the first observation of low-energy solar neutrinos scattering off electrons in the XENONnT detector during a seminar hosted by the INFN Laboratori Nazionali del Gran Sasso on August 31. [^1]\n\nThe LUX-Zeplin (LZ) experiment, located 1.5 kilometers underground in the Sanford Underground Research Facility in South Dakota, registered a single anomalous event during 220 days of data collection between March 2023 and April 2024. [^2]\n\nThe detected signal is dominated by pp neutrinos, which are produced in the proton-proton fusion reactions that power the sun and account for the vast majority of its neutrino emission. [^3]\n\nThe measurement extends the frontier of direct neutrino observations down to neutrino energies of about 17 keV, the lowest neutrino energy threshold ever achieved. [^4]\n\nRick Gaitskell, spokesperson for the LUX-Zeplin collaboration, stated that the team does not claim to have seen dark matter but found something interesting to share with the scientific community. [^5]\n\nThe event has a local statistical significance of 3.4 sigma, but after testing 616 model variants, the significance drops to 2.6 sigma, which is below the standard threshold for a discovery. [^6]\n\nThe recorded event occurred on June 16, 2023, at 21:22 UTC, with a reconstructed recoil energy of 248 keV and an uncertainty of 23 keV. [^7]\n\nFlorian Jörg, a postdoc in Baudis' group, stated that the same detector properties that make these technologies powerful in the search for dark matter allow them to study solar neutrino physics in a new energy range. [^8]", "cited": "[{\"statement\":\"Researchers in the XENON Collaboration announced the first observation of low-energy solar neutrinos scattering off electrons in the XENONnT detector during a seminar hosted by the INFN Laboratori Nazionali del Gran Sasso on August 31.\",\"source\":\"Phys.org\",\"instrument\":\"News\",\"claim_key\":null,\"published_at\":\"2026-09-01T18:40:03.000Z\",\"publisher_count\":1,\"sources\":[\"Phys.org\"]},{\"statement\":\"The LUX-Zeplin (LZ) experiment, located 1.5 kilometers underground in the Sanford Underground Research Facility in South Dakota, registered a single anomalous event during 220 days of data collection between March 2023 and April 2024.\",\"source\":\"DER STANDARD\",\"instrument\":\"News\",\"claim_key\":null,\"published_at\":\"2026-09-02T11:09:13.000Z\",\"publisher_count\":1,\"sources\":[\"DER STANDARD\"]},{\"statement\":\"The detected signal is dominated by pp neutrinos, which are produced in the proton-proton fusion reactions that power the sun and account for the vast majority of its neutrino emission.\",\"source\":\"Phys.org\",\"instrument\":\"News\",\"claim_key\":null,\"published_at\":\"2026-09-01T18:40:03.000Z\",\"publisher_count\":1,\"sources\":[\"Phys.org\"]},{\"statement\":\"The measurement extends the frontier of direct neutrino observations down to neutrino energies of about 17 keV, the lowest neutrino energy threshold ever achieved.\",\"source\":\"Phys.org\",\"instrument\":\"News\",\"claim_key\":null,\"published_at\":\"2026-09-01T18:40:03.000Z\",\"publisher_count\":1,\"sources\":[\"Phys.org\"]},{\"statement\":\"Rick Gaitskell, spokesperson for the LUX-Zeplin collaboration, stated that the team does not claim to have seen dark matter but found something interesting to share with the scientific community.\",\"source\":\"DER STANDARD\",\"instrument\":\"News\",\"claim_key\":null,\"published_at\":\"2026-09-02T11:09:13.000Z\",\"publisher_count\":1,\"sources\":[\"DER STANDARD\"]},{\"statement\":\"The event has a local statistical significance of 3.4 sigma, but after testing 616 model variants, the significance drops to 2.6 sigma, which is below the standard threshold for a discovery.\",\"source\":\"DER STANDARD\",\"instrument\":\"News\",\"claim_key\":null,\"published_at\":\"2026-09-02T11:09:13.000Z\",\"publisher_count\":1,\"sources\":[\"DER STANDARD\"]},{\"statement\":\"The recorded event occurred on June 16, 2023, at 21:22 UTC, with a reconstructed recoil energy of 248 keV and an uncertainty of 23 keV.\",\"source\":\"DER STANDARD\",\"instrument\":\"News\",\"claim_key\":null,\"published_at\":\"2026-09-02T11:09:13.000Z\",\"publisher_count\":1,\"sources\":[\"DER STANDARD\"]},{\"statement\":\"Florian Jörg, a postdoc in Baudis' group, stated that the same detector properties that make these technologies powerful in the search for dark matter allow them to study solar neutrino physics in a new energy range.\",\"source\":\"Phys.org\",\"instrument\":\"News\",\"claim_key\":null,\"published_at\":\"2026-09-01T18:40:03.000Z\",\"publisher_count\":1,\"sources\":[\"Phys.org\"]}]", "kind": "news" }, "receipt_verify": "Ed25519 over the dot-joined string `slice_hash.cursor_from.cursor_to.view.view_version.row_count`; 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It never makes a claim true." }