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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
The three steps of the proton-proton chain are: 1) initiating reaction where two protons fuse to form a deuterium nucleus, 2) the deuterium nucleus combines with another proton to form a helium-3 nucleus, and 3) two helium-3 nuclei fuse to produce a helium-4 nucleus and release two protons.
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