A Measurement of Solar pp Neutrino Flux using PandaX-4T Electron Recoil Data

arxiv(2024)

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摘要
The proton-proton (pp) fusion chain dominates the neutrino production from the Sun. The uncertainty of the predicted pp neutrino flux is at the sub-percent level, whereas that of the best measurement is 𝒪(10%). Furthermore, no direct measurement has been made via electron scattering below 165 keV recoil energy. Using the PandaX-4T commissioning data with 0.63 tonne×year of exposure, we perform the first measurement of solar pp neutrinos in the recoil energy range from 24 to 144 keV. The pp neutrino flux is measured to be (10.3 ± 3.7 (stat.)± 9.6 (syst.) )× 10^10s^-1cm^-2, consistent with Standard Solar Model and existing measurements.
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