Sprecher
Beschreibung
Neutrino oscillations are a fundamental quantum phenomenon demonstrating that neutrinos have non-zero mass and that the Standard Model in its minimal form must be extended. Their precise measurement plays a central role in particle physics and astroparticle physics, providing unique insight into the properties of neutrinos and their role in the Universe.
The Jiangmen Underground Neutrino Observatory (JUNO) in China, first proposed more than 15 years ago, started taking data in August 2025, only ten years after the start of civil construction. With its 20-kiloton liquid scintillator target, JUNO is the first multi-kiloton liquid scintillator detector designed to combine its large size with unprecedented energy resolution. This unique combination enables the observation of the fine oscillation pattern of reactor antineutrinos, opening a new era of precision neutrino oscillation measurements while providing sensitivity to a broad range of neutrino and astroparticle physics topics.
In this lecture, I will review the physics of reactor neutrino oscillations, the experimental challenges of precision measurements, and the design and performance of the JUNO detector. I will present the latest oscillation results based on 207.2 days of data taking, which establish JUNO as the world's leading experiment for precision measurements of the solar oscillation parameters. I will further discuss the first percent-level measurement of the atmospheric mass-squared splitting, the current sensitivity to the neutrino mass ordering, and the implications of these results for our understanding of neutrino oscillations. Finally, I will present JUNO's broader scientific program, including its first geoneutrino results. Finally, I will provide an overview of JUNO's broader scientific program and present the experiment's first measurement of geoneutrinos.