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Neutrino-driven ejecta in core collapse supernovae (CCSNe) offer aninteresting astrophysical scenario where lighter heavy elements between Sr andAg can be synthesized. Previous studies emphasized the important role that($\alpha,n$) reactions play in the production of these elements, particularlyin neutron-rich and alpha-rich environments. In this paper, we haveinvestigated the sensitivity of elemental abundances to specific ($\alpha,n$)reaction-rate uncertainties under different astrophysical conditions. Followinga Monte Carlo nucleosynthesis study with over 36 representative astrophysicalwind conditions, we have identified the most important reactions based on theirimpact on the final elemental abundances. Experimental studies of thesereactions will reduce the nucleosynthesis uncertainties and make it possible touse observations to understand the origin of lighter heavy elements and theastrophysical conditions where they are formed.

Nuclear physics uncertainties in neutrino-driven, neutron-rich supernova ejecta