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arXiv · 2512.14824

Towards First Detection of the Solar MSW Transition With JUNO

Obada Nairat·John F. Beacom·Kevin J. Kelly·Shirley Weishi Li
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Abstract

Matter-induced neutrino flavor mixing (the Mikheyev-Smirnov-Wolfenstein, or MSW, effect) is a central prediction of the neutrino mixing framework, but it has not been conclusively observed. Direct observation of the energy-dependent MSW transition in the solar electron-neutrino survival probability would solve this, but backgrounds have been prohibitive. We show that our new technique for suppressing muon-induced spallation backgrounds will allow JUNO to measure the MSW transition at $>$4$\sigma$ significance in 10 years. This would strongly support upcoming multi-\$1B next-generation experiments and their goals in cementing the neutrino mixing framework.

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Obada Nairat, John F. Beacom, Kevin J. Kelly, Shirley Weishi Li. 2025-12-16. Towards First Detection of the Solar MSW Transition With JUNO. https://doi.org/10.1103/qhr8-qhhp

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