The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation neutrino experiment located in China. Although the main goals of JUNO are to determine the neutrino mass ordering (NMO) and to perform sub-percent precision measurements of oscillation parameters with reactor antineutrinos, its physics program is broader and includes studies on solar neutrinos. The JUNO central detector is an acrylic sphere 35. 4 meters in diameter filled with 20 kt of liquid scintillator (LS). It is equipped with photomultiplier tubes (PMTs) of two types: 17, 612 20-inch PMTs and 25, 600 3-inch PMTs. The central detector is designed to provide an unprecedented energy resolution of 3% at 1 MeV. Although the target level of radiopurity of LS for performing the NMO analysis is set at 10^-15 g/g of ^238U and ^232Th, the solar neutrino analysis targets a level below 10^-16-10^-17 g/g. The exceptional radiopurity of JUNO will enable the detection of neutrinos produced in the Sun in the pp chain — ⁸B, ⁷Be, pep neutrinos — as well as neutrinos from the CNO cycle. Depending on the exact achieved background level, JUNO will set stringent limits on the fluxes of ⁷Be, pep and CNO neutrinos, potentially exceeding the limits of Borexino in a few years of data-taking. The primary detection channel for solar neutrinos in JUNO is the neutrino-electron elastic scattering process. However, JUNO's large target mass of ^13C nuclei makes possible the first model-independent measurement of ⁸B solar neutrinos via charged-current and neutral-current interactions on ^13C, complementing the elastic scattering channel.
Arsenii Gavrikov (Wed,) studied this question.