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Wednesday, September 2, 2026 · UTC
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XENONnT Detector Achieves First Measurement of Low-Energy Solar Neutrinos

Researchers using the XENONnT detector observed the first scattering of low-energy solar neutrinos off electrons.

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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] 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. [2] 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. [3] The measurement extends the frontier of direct neutrino observations down to neutrino energies of about 17 keV, the lowest neutrino energy threshold ever achieved. [4] 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. [5] 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. [6] 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. [7] 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. [8]
What this stands on
  1. 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. · Phys.org
  2. 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. · DER STANDARD
  3. 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. · Phys.org
  4. The measurement extends the frontier of direct neutrino observations down to neutrino energies of about 17 keV, the lowest neutrino energy threshold ever achieved. · Phys.org
  5. 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. · DER STANDARD
  6. 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. · DER STANDARD
  7. 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. · DER STANDARD
  8. 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. · Phys.org
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