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Measurement of Coherent Elastic Neutrino-Nucleus Scattering from Reactor Antineutrinos
J Colaresi1, J I Collar2, T W Hossbach3
1Mirion Technologies Canberra, 800 Research Parkway, Meriden, Connecticut 06450, USA.
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.
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