How Neutrinos Switch Flavors While Traveling Through the Sun ⚡ экспресс
The MSW effect (Mikheyev–Smirnov–Wolfenstein) is a central prediction of neutrino oscillation theory, yet its direct observation is missing. Measuring the energy dependence of the survival probability of solar electron neutrinos faces a high background from muon-induced spallation reactions. The developed technique for suppressing this background in the JUNO detector will enable measuring the MSW transition with a significance level >4σ over 10 years of exposure. The result will provide a firm confirmation of the oscillation picture and significantly strengthen the case for next-generation, multi-billion-dollar, long-baseline experiments.
Our Sun emits streams of neutrinos — particles that barely interact with matter. Passing through the dense solar material, they change their type — scientists call this 'flavor.' It's like a voice that changes as it moves through a crowd: the thicker the crowd, the more it gets distorted.
This effect was long predicted by theory, but hearing it directly was drowned out by the roar of cosmic noise — as if you were trying to make out a whisper during a rock concert. The JUNO detector in China uses a method that works like a smart noise-canceling system: it filters out the racket and, over ten years, will gather enough data to pinpoint how neutrino energy affects their spectrum of transformations.
Unexpected fact: neutrinos born in the Sun's core almost completely change their type before even emerging. What Earth-based detectors pick up are already the 'foreign voices' of these particles. The discovery will strengthen the Standard Model of physics and support future giant experiments.
🎯 Trillions of solar neutrinos zip through your body every second — you never even notice.