Solar Neutrino Energies

Solar Neutrino Energies

. Neutrinos are produced inside the Sun as a byproduct of nuclear fusion reactions in its core, but both the amounts and energies of the neutrinos depend on the element fused and the detailed model of the solar interior. Here we show the neutrino flux predicted by the Standard Solar Model. The largest flux of solar neutrinos is found at low energies; they are produced by the main proton-proton, pp, reaction in the Sunís core. Less abundant, high-energy neutrinos are produced by a rare side reaction involving boron 8. The shading denotes the detection range for the gallium, chlorine and water experiments, with detection thresholds marked by the vertical lines. The gallium experiment can detect the low-energy pp neutrinos, as well as those of higher energy; both the chlorine and water detectors are sensitive to the high-energy boron-8 neutrinos.

Copyright 2010, Professor Kenneth R. Lang, Tufts University