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

2025/11/14 by M. Abreu, Manuel Abreu, Abreu, M. +240 · 1 voice · 5 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Neutrino Physics Research #hep-ex

paper · pdf · doi:10.48550/arxiv.2511.11856

openalex publication_date 2025/11/14 · arxiv published 2025/11/14 · openalex created_date 2025/11/19 · openalex updated_date 2026/07/28 · arxiv created 2026/07/30 · arxiv updated 2026/07/30

Abstract

The SNO+ Collaboration reports new results on reactor antineutrino oscillations using data acquired from May 2022 through July 2025. The spectral analysis of a flux dominated by nuclear reactors at 240, 350, and 355 kilometers yields the mass-squared difference Δm²₂₁=(7.93^+0.21_-0.24)× 10^-5 eV². This result is compatible with and approaches the precision of the only other long-baseline reactor antineutrino measurement, by KamLAND. Combining these measurements, along with those from solar neutrino experiments, the global values of the neutrino mixing parameters become: Δm²₂₁ = (7.63±0.17)× 10^-5 eV² and sin²θ₁₂=0.310±0.012. The analysis of geoneutrinos at SNO+ is also improved, with a measured signal of 49⁺¹³_-12 TNU.

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Discussions

• SNO+ measures solar oscillation parameters arxiv.org/abs/2511.11856. Their precision isnt the best but it's nice to have another reactor neutrino measurement alongside KamLAND! The value of Dmsq21 aff [bsky, 3 points, 0 comments]

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