= Temperature for helium-3 freeze-out
{title2=$\tau(T)\sim t_\odot$}
Equilibrium fails where the <helium-3 relaxation time> becomes comparable to stellar age. In a fixed-density pp-I scaling with reaction exponents four and sixteen, the equilibrium abundance scales as $T^{-6}$ and the relaxation time as $T^{-10}$. Central normalization then places the transition near six million kelvin; using the full supplied exponential factors gives a somewhat higher estimate. A precise radius or <temperature> requires a stellar <mass density>/composition profile and the second branch contribution.
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