31.08.2026 XENONnT First to Observe low Energy Solar Neutrinos

The XENONnT experiment has recently achieved a new milestone in the study of solar neutrinos, observing neutrino–electron interactions at energies as low as 17keV with a significance of 5 sigma. The experiment's ultra-low background and low energy threshold allow it to detect these rare neutrino interactions, extending the accessible energy range by more than an order of magnitude compared to previous experiments (arXiv preprint). Solar neutrinos are produced by the nuclear fusion processes that power the Sun and provide a unique window into its core. This result demonstrates the potential of liquid-xenon detectors as multipurpose observatories, opening a new window into low-energy neutrino physics. Got curious? Please make sure to also have a look at the in-depth article on our UZH News page.