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Oct 25, 2019 at 15:57 comment added PM 2Ring In the p-p chain, 2 protons have to fuse into a diproton before 1 of them decays to a neutron, and that decay has a very low probability of occurring in time before the diproton just splits up into 2 protons. There simply isn't enough energy for a free proton in the Sun's core to convert to a neutron, it has to be bound to another proton first.
Oct 25, 2019 at 9:47 history answered Jamie Smith CC BY-SA 4.0