New constraints on coherent elastic neutrino-nucleus scattering by the νGeN experiment

Belov V. Bystryakov A. Danilov M. Evseev S. Fomina M. Ignatov G. Kazartsev S. Khushvaktov J. Khussainov T. Konovalov A. Kuznetsov A. Lubashevskiy A. Medvedev D. Ponomarev D. Sautner D. Shakhov K. Shevchik E. Shirchenko M. Rozov S. Rozova I. Vasilyev S. Yakushev E. Zhitnikov I. Zinatulina D.
1 May 2025 Institute of Physics

Chinese Physics C
2025 #49 Issue 5

The GeN experiment searches for coherent elastic neutrino-nucleus scattering (CE NS) at the Kalinin Nuclear Power Plant. A 1.41 kg high-purity low-threshold germanium detector surrounded by active and passive shielding is deployed at the minimal distance of 11.1 m allowed by the lifting mechanism from the center of the reactor core, utilizing one of the highest antineutrino fluxes among competing experiments. The direct comparison of the count rates obtained during reactor-ON and reactor-OFF periods with the energy threshold of 0.29 keV shows no statistically significant difference. New upper limits on the number of CE NS events are evaluated on the basis of the residual ON OFF count rate spectrum.

$ u $GeN , antineutrino , coherent elastic neutrino-nucleus scattering , germanium detector , low background

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Dzhelepov Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 6 Joliot-Curie, Dubna, 141980, Russian Federation
Institute for Nuclear Research, The Russian Academy of Sciences, 7a Prospect 60-letiya Oktyabrya, Moscow, 117312, Russian Federation
Lebedev Physical Institute, The Russian Academy of Sciences, 53 Leninskiy Prospect, Moscow, 119991, Russian Federation
Dubna State University, 19 Universitetskaya St., Dubna, 141980, Russian Federation
Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny, 141700, Russian Federation
Institute of Nuclear Physics, The Ministry of Energy of the Republic of Kazakhstan, 1 Ibragimov Street, Almaty, 050032, Kazakhstan

Dzhelepov Laboratory of Nuclear Problems
Institute for Nuclear Research
Lebedev Physical Institute
Dubna State University
Moscow Institute of Physics and Technology
Institute of Nuclear Physics

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