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The reaction $^{96}$Zr($\alpha$,n)$^{99}$Mo plays an important role in$\nu$-driven wind nucleosynthesis in core-collapse supernovae and is a possibleavenue for medical isotope production. Cross section measurements wereperformed using the activation technique at the Edwards Accelerator Laboratory.Results were analyzed along with world data on the $^{96}{\rm Zr}(\alpha,n)$cross section and $^{96}{\rm Zr}(\alpha,\alpha)$ differential cross sectionusing large-scale Hauser-Feshbach calculations. We compare our data, previousmeasurements, and a statistical description of the reaction. We find a largercross section at low energies compared to prior experimental results, allowingfor a larger astrophysical reaction rate. This may impact results ofcore-collapse supernova $\nu$-driven wind nucleosynthesis calculations, butdoes not significantly alter prior conclusions about $^{99}{\rm Mo}$ productionfor medical physics applications. The results from our large-scaleHauser-Feshbach calculations demonstrate that phenomenological opticalpotentials may yet be adequate to describe $(\alpha,n)$ reactions of interestfor $\nu$-driven wind nucleosynthesis, albeit with regionally-adjusted modelparameters.

Measurements of the $^{96}$Zr($\alpha$,n)$^{99}$Mo cross section for astrophysics and applications