three-alpha process

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three-alpha process [′thrē ¦al·fə ′prä‚səs]

(astrophysics)

A nuclear reaction in which three helium-4 nuclei (alpha particles) combine to form a carbon-12 nucleus, with the emission of a gamma ray; it converts helium into carbon in red giants. Also known as Salpeter process; triple-alpha process.

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