Speaker
Description
The SNO+ Experiment is a 780-ton liquid-scintillator detector located approximately 240, 250, and 355 kilometers from the nearest dominant nuclear reactors. Using a dataset corresponding to 684.9 live days, the SNO+ Collaboration reports an updated measurement of the solar neutrino oscillation parameter $\Delta m^2_{21}=(7.93^{+0.21}_{-0.24})\times10^{-5}$ eV$^2$. When combined with Particle Data Group (PDG 2025) constraints, the global best-fit oscillation parameters become $\Delta m^2_{21}=(7.63 \pm 0.17 )\times10^{-5}$ eV$^2$ and $\sin^2\theta_{12}=0.310\pm0.012$. The SNO+ measurement of $\Delta m^2_{21}$ is compatible with results from other long-baseline reactor antineutrino experiments, such as KamLAND. In addition, the geoneutrino inverse beta decay (IBD) rate is improved to $49^{+13}_{-12}$ TNU, providing a refined input for future geological studies and enabling a comparison with corresponding measurements
from KamLAND and Borexino.