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We report the best limit on coherent elastic scattering of electronantineutrinos emitted from a nuclear reactor off germanium nuclei. Themeasurement was performed with the CONUS detectors positioned at 17.1m from the3.9GWth reactor core of the nuclear power plant in Brokdorf, Germany. Theantineutrino energies of less than 10 MeV assure interactions in the fullycoherent regime. The analyzed dataset includes 248.7 kgd with the reactorturned on and background data of 58.8 kgd with the reactor off. With aquenching parameter of k = 0.18 for germanium, we determined an upper limit onthe number of neutrino events of 85 in the region of interest at 90% confidencelevel. This new CONUS dataset disfavors quenching parameters above k = 0.27,under the assumption of standard-model-like coherent scattering of the reactorantineutrinos.

Constraints on elastic neutrino nucleus scattering in the fully coherent regime from the CONUS experiment