The $\gamma$-ray emitting radioisotopes produced during explosive Si-burning in core-collapse supernovae (CCSNe) could serve as a probe to supernovae explosion energetics. Especially important are the three isotopes ${}^{43}\mathrm{K}$, ${}^{47}\mathrm{Sc}$, and ${}^{59}\mathrm{Fe}$ as these are potentially detectable with next generation space-based $\gamma$-ray telescopes. However, current nuclear physics uncertainties hinder model-observation comparisons. The ${}^{28}\mathrm{Al}(p,\alpha ){}^{25}\mathrm{Mg}$ reaction has been shown to be among the most important reactions which impact the production of these three $\gamma$ emitters in CCSNe. We report on the first observation of resonant states in the compound nucleus ${}^{29}\mathrm{Si}$, which were populated via the ${}^{28}\mathrm{Si}(d,p){}^{29}\mathrm{Si}$ reaction. This measurement provides the first experimental determination of the ${}^{28}\mathrm{Al}(p,\alpha ){}^{25}\mathrm{Mg}$ reaction rate. This new measurement, along with associated uncertainty limits, removes one of the most important nuclear physics uncertainties in the production of ${}^{43}\mathrm{K}$, ${}^{47}\mathrm{Sc}$, and ${}^{59}\mathrm{Fe}$ $\gamma$-emitting radioisotopes in CCSNe.

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• H & He induced nuclear reactions
• Nuclear physics of explosive environments
• Nuclear reactions
• Nucleosynthesis in explosive environments
• Transfer reactions
• 20 ≤ A ≤ 38