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The proton proton chain consists of three chains:

85.9 % PP1) H+H -> 2H -> 2H-(e+)-(v) + H -> 3He

3He + 3He -> 4He + 2H

14 % PP2) 3He + 4He -> 7Be -> 7Be-(e-)-(gamma) -> 7Li -> 7Li-(v)+H -> 4He + 4He

0.1 % PP3) 7Be + H -> 8B - (gamma) -> 8Be + (e+) + (v) -> 4He + 4He

where i have used the notations:

  • v for neutrino
  • (gamma) for gamma particle
  • e+ for positron
  • e- for electron
  • x% means it accounts for x% of the total conversion of H -> He
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