Neutrinos from the solar CNO cycle are detected

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The Borexino collaboration reported the first direct detection of neutrinos produced by the carbon-nitrogen-oxygen cycle in the Sun, published in Nature. The CNO cycle accounts for only about one per cent of solar energy output, so the signal sits far below the proton-proton chain and required years of work on radiopurity and thermal stability of the detector to extract. Its importance is not solar: CNO is the dominant hydrogen-burning route in stars above roughly 1.3 solar masses, so this is the observational confirmation of the energy source of most of the luminous stellar mass in the Galaxy.

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