Reactor Antineutrino Oscillations and Geoneutrinos in SNO+

William Parker

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arXiv · 2604.05746

Reactor Antineutrino Oscillations and Geoneutrinos in SNO+

William Parker

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Abstract

SNO+ is a multipurpose liquid-scintillator neutrino detector located 2 km underground at SNOLAB, Canada. Three large nuclear reactors at baselines of 240-350 km allow a precise measurement of the neutrino oscillation parameter $Δm^2_{21}$ and, to a lesser extent, $θ_{12}$. A spectral analysis is performed, simultaneously fitting $Δm^2_{21}$, $θ_{12}$, the reactor antineutrino flux, background rates, and associated systematics. Using data collected between May 2022 and July 2025, corresponding to a livetime of 685 days, a value of $Δm^2_{21} = (7.93^{+0.21}_{-0.24}) \times 10^{-5}$ eV$^2$ is obtained. This result is compatible with other long-baseline reactor antineutrino measurements by KamLAND and JUNO. SNO+ has also made the first measurement of the geoneutrino flux in the Western Hemisphere, measuring $49^{+13}_{-12}$ TNU, in agreement with predictions from geological models.

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William Parker. 2026-04-07. Reactor Antineutrino Oscillations and Geoneutrinos in SNO+. https://arxiv.org/abs/2604.05746

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