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The globular cluster NGC 2419 was the first to exhibit a Mg-Kanticorrelation, linked to hydrogen burning at temperatures between 80-260 MK.However, the key K-destroying reaction,$^{39}\mathrm{K}(p,\gamma)^{40}\mathrm{Ca}$, has a large rate uncertainty inthis range. We significantly constrain this rate with a high resolution$^{39}\mathrm{K}(^{3}\mathrm{He},d)^{40}\mathrm{Ca}$ study. We resolve theE$_{\text{r}}^{\text{c.m.}} = 154$ keV resonance in $^{39}\mathrm{K}+p$ for thefirst time, increasing the previous rate by up to a factor 13 and reducing its$1\sigma$ width by up to a factor of 42. Reaction network calculations for NGC2419 suggest that this could lower temperatures needed to reproduce the Mg-Kanticorrelation.

High Resolution Study of $^{40}$Ca to Constrain Potassium Nucleosynthesis in NGC 2419