Hi Andrew
I've never heard of the PP IV reaction until you mentioned the WIKI article on it. There's no mention of it in any of my reference books. It certainly looks like a simpler way to get a light Helium atom 3He (2 Protons + 1 Neutron) up to a full blown Helium atom 4He (2 Protons + 2 Neutrons).
Has the PP IV reaction been recently discovered? This may explain the omission from all the books I've got. The only other reason I can think of is that it has not been observed, so was deliberately omitted for that reason.
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