the ones mentioned higher in this article. The table concerns only the 99% of the power and neutrinos that come from the reactions, not the 1% coming from the CNO cycle. The PEP reaction A deuteron can also be produced by the rare pep (proton–electron–proton) reaction (electron capture): :{| border="0" |- style="height:2em;" | ||+ || ||+ || ||→ || ||+ || |} In the Sun, the frequency ratio of the pep reaction versus the reaction is 1:400. However, the neutrinos released by the pep reaction are far more energetic: while neutrinos produced in the first step of the reaction range in energy up to , the pep reaction produces sharp-energy-line neutrinos of . Detection of solar neutrinos from this reaction were reported by the Borexino collaboration in 2012. Both the pep and reactions can be seen as two different Feynman representations of the same basic interaction, where the electron passes to the right side of the reaction as a positron. This is represented in the figure of proton–proton and electron-capture reactions in a star, available at the NDM'06 web site. See also CNO cycle Triple-alpha process References External links Nuclear fusion reactions Proton