An important validation of nucleosynthesis models of core-collapse supernovae is the comparison of radioisotope predictions to abundances inferred from observations of $\gamma$ rays emitted in remnants. One such isotope, ${}^{44}\mathrm{Ti}$, is especially sensitive to the ${}^{57}\mathrm{Ni}(p,\gamma ){}^{58}\mathrm{Cu}$ reaction rate. Despite this importance, no experimentally constrained rate exists for this reaction. It is thus crucial to determine this rate. GRETINA ORRUBA: Dual Detectors for Experimental Structure Studies (GODDESS) was used along with the first use of the Enge split-pole spectrograph at Notre Dame to measure structure properties of ${}^{58}\mathrm{Cu}$ via the ${}^{58}\mathrm{Ni}({}^3\mathrm{He},t){}^{58}\mathrm{Cu}$ reaction. The combined analysis of these complementary data sets allows for precise determination of ${}^{58}\mathrm{Cu}$ level energies, and spins are constrained from analysis of the $\gamma$-ray decay. ${}^{44}\mathrm{Ti}$ yields were found to change by over 25% compared to previous estimates in model calculations using the new experimentally constrained reaction rate.

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• Energy levels
• Explosive burning
• Nuclear astrophysics
• Nuclear reaction rates
• Resonance reactions