Detection of neutrinos from the primary proton-proton fusion process in the Sun with Borexino

Daniel Bick (Univ. Hamburg)
DESY Auditorium, 16.45 h

In the core of our Sun, energy is released through fusion of hydrogen to helium. The primary reaction is the fusion of two protons accompanied by the emission of a low-energy neutrino. These so-called pp-neutrinos are the largest component of the solar neutrino flux, outnumbering those emitted in the subsequent reactions by far. Due to the low energy of the pp-neutrinos, they have not been observed directly until recently. Now the Borexino experiment has succeeded in the spectroscopic measurement of pp-neutrinos using 300 tons of liquid scintillator with an unprecedented radio-purity. With this observation, the flux of al neutrinos from the pp-chain has for the first time been observed in a single experiment.

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