First Measurement of Solar Neutrinos through Elastic Neutrino-Electron Scattering at the keV Scale

@misc{aprile2026first,
  title = {{First Measurement of Solar Neutrinos through Elastic Neutrino-Electron Scattering at the keV Scale}},
  author = {E Aprile and J Aalbers and K Abe and M Abu Rmilah and M Adrover and S. Ahmed Maouloud and L Althueser and B Andrieu and E Angelino and D. Antón Martin and S.R Armbruster and F Arneodo and L Baudis and M Bazyk and V Beligotti and L Bellagamba and R Biondi and K Boese and R.M Braun and G Bruni and R Budnik and C Cai and C Capelli and J.M.R Cardoso and A.P. Cimental Chavez and A.P Colijn and J Conrad and J.J Cuenca-García and H Dai and V d'Andrea and L.C. Daniel Garcia and M.P Decowski and A Deisting and C Di Donato and P Di Gangi and S Diglio and K Eitel and S. El Morabit and R Elleboro and A Elykov and A.D Ferella and C Ferrari and H Fischer and T Flehmke and M Flierman and R Frankel and D Fuchs and W Fulgione and C Fuselli and F Gao and R Giacomobono and R Glade-Beucke and L Grandi and J Grigat and M Guida and P Gyorgy and R Hammann and C Hils and L Hoetzsch and N.F Hood},
  howpublished = {HAL},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.29450},
  eprint = {2608.29450},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05742609v1},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - First Measurement of Solar Neutrinos through Elastic Neutrino-Electron Scattering at the keV Scale
AU  - E Aprile
AU  - J Aalbers
AU  - K Abe
AU  - M Abu Rmilah
AU  - M Adrover
AU  - S. Ahmed Maouloud
AU  - L Althueser
AU  - B Andrieu
AU  - E Angelino
AU  - D. Antón Martin
AU  - S.R Armbruster
AU  - F Arneodo
AU  - L Baudis
AU  - M Bazyk
AU  - V Beligotti
AU  - L Bellagamba
AU  - R Biondi
AU  - K Boese
AU  - R.M Braun
AU  - G Bruni
AU  - R Budnik
AU  - C Cai
AU  - C Capelli
AU  - J.M.R Cardoso
AU  - A.P. Cimental Chavez
AU  - A.P Colijn
AU  - J Conrad
AU  - J.J Cuenca-García
AU  - H Dai
AU  - V d'Andrea
AU  - L.C. Daniel Garcia
AU  - M.P Decowski
AU  - A Deisting
AU  - C Di Donato
AU  - P Di Gangi
AU  - S Diglio
AU  - K Eitel
AU  - S. El Morabit
AU  - R Elleboro
AU  - A Elykov
AU  - A.D Ferella
AU  - C Ferrari
AU  - H Fischer
AU  - T Flehmke
AU  - M Flierman
AU  - R Frankel
AU  - D Fuchs
AU  - W Fulgione
AU  - C Fuselli
AU  - F Gao
AU  - R Giacomobono
AU  - R Glade-Beucke
AU  - L Grandi
AU  - J Grigat
AU  - M Guida
AU  - P Gyorgy
AU  - R Hammann
AU  - C Hils
AU  - L Hoetzsch
AU  - N.F Hood
PY  - 2026
DA  - 2026/08/29
PB  - HAL
DO  - 10.48550/arxiv.2608.29450
UR  - https://hal.science/hal-05742609v1
AB  - We report on the first measurement of low-energy solar neutrinos through elastic neutrino-electron scattering in a dark matter experiment, establishing the lowest energy threshold for any neutrino detection to date. The measurement utilizes data from the first two science runs of XENONnT, corresponding to an exposure of 2.46 t · y, and covers electron recoil energies between 1 keV and 140 keV, providing sensitivity to solar neutrinos with energies down to 17 keV. We reject the background-only hypothesis with a statistical significance of 5.0σ and measure a solar pp neutrino flux of (10.2 ± 2.0) × 10^10 cm^−2 s^−1. The result is larger, but statistically consistent with the previous measurement by Borexino at 1.9σ. Together with recent observations of coherent elastic neutrino-nucleus scattering of ^8B solar neutrinos in XENONnT and other liquid-xenon time projection chambers, these results demonstrate the growing potential of liquid xenon detectors for neutrino physics down to the keV-scale and represent an important milestone towards a next-generation multipurpose observatory.
ER  -