GeV/n [@heavyion]. Averaging the measured $p^{A=3}_0/p^{A=2}_0$ (molecular targets excluded) we infer the relation $$\begin{aligned}
p^{A=3}_0 = 1.28~p^{A=2}_0 = 0.246 \pm 0.038~\text{GeV/c}.\end{aligned}$$ Without parton-level production rates, such as $pp \to$ [$^3\overline{\text{He}}~$]{}at the LHC we need to rely on the outlined ad-hoc schemes, which yield the largest systematic uncertainty on the final flux. In the remainder of this analysis, we use the binding energies to determine $p_0^{A=3}$.

Formation of antihelium-3 proceeds through two channels: directly through coalescence of $\bar{p}\bar{p}\bar{n}$, and through the formation and decay of tritium $(\bar{p}\bar{n}\bar{n})$. As noted in Ref. [@cosmic_antimatter], the former channel is suppressed by the Coulomb repulsion of the antiprotons, while the tritium channel is not. Although it is not clear what this suppression factor is, a conservative approach ignores the direct antihelium-3 channel completely. Tritium is stable on collider timescales, and therefore we can directly study the relative production rates. Data from the Bevalac [@heavyion] and CERN-SPS [@heavyion2] heavy-ion collisions indicates that the ratio of tritium to antihelium-3 production rates $\epsilon = R_{\rm H3}/R_{\rm He3}$ varies between 0 and 1, perhaps as an increasing function the center of mass energy with efficiency near unity around $\mathcal{O}$(50 GeV). For the rest of this analysis we choose $\epsilon=1$, 