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physical phenomena > energy source > exothermic fusion process > hydrogen burning > proton-proton chain > PP I
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PP I comparison table
Subject has reaction is a kind of is an instance of has definition
proton-proton chain pycnonuclear reaction An important nuclear fusion reaction that occurs in stars. It begins with the fusion of two hydrogen nuclei, each of which consists of a single proton.
PP I1H(p, β+v)2D(p, γ)3He(3He, 2p)4He proton-proton chainA thermonuclear reaction in which hydrogen nuclei are transformed into helium nuclei producing 4 × 10-5 ergs of energy. Although the neutrinos from this reaction are detectable, they have not been observed.

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