= Effective proton-proton reaction network
{title2=$\dot{\boldsymbol n}=\mathsf S\boldsymbol R$}
An effective <Proton–proton chain> network can track <protons>, <deuterium>, <helium-3>, <helium-4> and lithium-7 after eliminating a rapidly adjusting beryllium intermediate. Identical-reactant event rates include a factor one half. Stoichiometric changes must count both <helium-4> products of lithium-7 <proton> capture. The weighted baryon <mass density> $n_1+2n_2+3n_3+4n_4+7n_7$ is conserved by the nuclear reactions at fixed volume.
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