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Final CONUS results on coherent elastic neutrino nucleus scattering at the Brokdorf reactor
N. Ackermann, H. Bonet, A. Bonhomme, C. Buck, K. Fülber, J. Hakenmüller, J. Hempfling, J. Henrichs, G. Heusser, M. Lindner, W. Maneschg, T. Rink, E. Sanchez Garcia, J. Stauber, H. Strecker, R. Wink
Résumé : The CONUS experiment studies coherent elastic neutrino nucleus scattering in four 1 kg germanium spectrometers. Low ionization energy thresholds of 210 eV were achieved. The detectors were operated inside an optimized shield at the Brokdorf nuclear power plant which provided a reactor antineutrino flux of up to 2.3*10^13/(cm^2 s). In the final phase of data collection at this site, we improved the constraints on the neutrino interaction rate as compared to the previous CONUS analysis by an order of magnitude. The new limit of less than 0.34 signal events/(kg d) is within a factor 2 of the rate predicted by the Standard Model.