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arXiv · 2202.09672

Measurement of Coherent Elastic Neutrino-Nucleus Scattering from reactor antineutrinos

J. Colaresi·J. I. Collar·T. W. Hossbach·C. M. Lewis·K. M. Yocum
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Abstract

The 96.4 day exposure of a 3 kg ultra-low noise germanium detector to the high flux of antineutrinos from a power nuclear reactor is described. A very strong preference ($p<1.2\times10^{-3}$) for the presence of a coherent elastic neutrino-nucleus scattering (CE$\nu$NS) 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 CE$\nu$NS 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 CE$\nu$NS 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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J. Colaresi, J. I. Collar, T. W. Hossbach, C. M. Lewis, K. M. Yocum. 2022-02-19. Measurement of Coherent Elastic Neutrino-Nucleus Scattering from reactor antineutrinos. https://doi.org/10.1103/physrevlett.129.211802

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