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Measurement of Coherent Elastic Neutrino-Nucleus Scattering from Reactor Antineutrinos
James F. Colaresi (Mirion Technologies (United States)), J. I. Collar (University of Chicago), T. W. Hossbach (Pacific Northwest National Laboratory), C. M. Lewis (University of Chicago), Katarina M. Yocum (Mirion Technologies (United States))
Abstract: The 96.4 day exposure of a 3 kg ultralow noise germanium detector to the high flux of antineutrinos from a power nuclear reactor is described. A very strong preference (p<1.2×10^{-3}) for the presence of a coherent elastic neutrino-nucleus scattering (CEνNS) component in the data is found, when compared to a background-only model. No such effect is visible in 25 days of operation during reactor outages. The best-fit CEνNS signal is in good agreement with expectations based on a recent characterization of germanium response to sub-keV nuclear recoils. Deviations of order 60% from the standard model CEνNS prediction can be excluded using present data. Standing uncertainties in models of germanium quenching factor, neutrino energy spectrum, and background are examined.