1. The standard solar model
... . 7Be + e- á 7Li + Ã 142 days In this case, instead of forming unstable 6Be, the fusion with 4He forms stable 7Be. But 7Be has an affinity for electron capture, and can absorb free electrons. The electron turns one of the Be protons into a neutron, changing the 7Be into 7Li, while tossing out a neutrino and a gamma ray photon. The lithium nucleus will then quickly ... . 7Li + 1H á 2 4He 9.5 minutes PPIII Chains (0.3% of the time) : The last part of the proton-proton chain, PPIII. The 7Be has two ways to go - it can absorb an electron, as in PPII ,or it can absorb a proton, as in PPII...
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