An Etymological Dictionary of Astronomy and Astrophysics
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A nuclear reaction in which two or more atomic nuclei fuse into a single heavier nucleus by a collision of the interacting particles at extremely high temperatures. Chains of thermonuclear reactions, such as the → proton-proton chain and the → CNO cycle, account for the energy radiated from the Sun and more massive stars.

→ thermo- + → nuclear; → reaction.

The minimum energy, for an incident particle or photon, below which a particular reaction does not occur.

→ threshold; → reaction.