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proton-proton chain
pro·ton-pro·ton chain (prō′tŏn′prō′tŏn′)n. A series of thermonuclear fusion reactions in which hydrogen nuclei fuse to form deuterium isotopes, which then fuse to form light helium isotopes and finally helium, releasing two hydrogen nuclei, neutrinos, positrons, and energy in the form of gamma rays. The proton-proton chain is the primary reaction fueling the luminosity of low-mass main-sequence stars, including the sun.proton-proton chain
proton-proton chain[′prō‚tän ′prō‚tän ‚chān] (nuclear physics) An energy-releasing nuclear reaction chain which is believed to be of major importance in energy production in hydrogen-rich stars. Also known as deuterium cycle. |