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arXiv · 2610.37318

High significance measurement of reactor coherent elastic neutrino-nucleus scattering on germanium by CONUS+

N. Ackermann·H. Bonet·C. Buck·J. Hakenmüller·G. Heusser·M. Lindner·W. Maneschg·M. Meier·S. Mertens·D. Piani·M. Rank·T. Rink·E. Sánchez García·Y. Shi·L. Schönfeld·I. Stalder·H. Strecker·J. Wendel·J. Woenckhaus
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Abstract

We report the most precise measurement to date of coherent elastic neutrino-nucleus scattering (CE$ν$NS) from reactor antineutrinos using the CONUS+ high-purity germanium detectors at the Leibstadt nuclear power plant. With an exposure of 1296 kg$\cdot$days reactor-on, a blind likelihood analysis yields $1555 \pm 152$ CE$ν$NS events, with a significance of 10.2 $σ$, in agreement with the Standard Model expectation of $1701 \pm 198$ events within 0.6 standard deviations. The result also determines the weak mixing angle at a momentum transfer of about 10 MeV, $\sin^2θ_W = 0.225 \pm 0.022$, consistent with the Standard Model prediction.

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N. Ackermann, H. Bonet, C. Buck, J. Hakenmüller, G. Heusser, M. Lindner, W. Maneschg, M. Meier, S. Mertens, D. Piani, M. Rank, T. Rink, E. Sánchez García, Y. Shi, L. Schönfeld, I. Stalder, H. Strecker, J. Wendel, J. Woenckhaus. 2026-10-27. High significance measurement of reactor coherent elastic neutrino-nucleus scattering on germanium by CONUS+. https://arxiv.org/abs/2610.37318

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