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Initial measurement of reactor antineutrino oscillation at SNO+

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arxiv 2405.19700 v2 pith:RKJCNFOC submitted 2024-05-30 hep-ex nucl-ex

classification hep-exnucl-ex
keywords deltaoscillationantineutrinodatameasurementneutrinoreactorallowed
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The SNO+ collaboration reports its first spectral analysis of long-baseline reactor antineutrino oscillation using 114 tonne-years of data. Fitting the neutrino oscillation probability to the observed energy spectrum yields constraints on the neutrino mass-squared difference $\Delta m^2_{21}$. In the ranges allowed by previous measurements, the best-fit $\Delta m^2_{21}$ is (8.85$^{+1.10}_{-1.33}$) $\times$ 10$^{-5}$ eV$^2$. This measurement is continuing in the next phases of SNO+ and is expected to surpass the present global precision on $\Delta m^2_{21}$ with about three years of data.

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  1. Measurement of reactor antineutrino oscillations with 1.46 ktonne-years of data at SNO+

    hep-ex 2025-11 accept novelty 6.0 of 10

    SNO+ measures Δm²₂₁ = (7.93^{+0.21}_{-0.24})×10⁻⁵ eV² from 1.46 ktonne-years of reactor antineutrino data and detects geoneutrinos at 49^{+13}_{-12} TNU.

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