Speaker
Dr
Lorenzo Roberti
(INAF - Osservatorio Astronomico di Palermo)
Description
The 12C+12C reaction rate is a critical parameter for the evolution of massive stars during their burning stages before the core-collapse, yet its uncertainties significantly affect the final pre-supernova structure. Contrary to intuitive expectations, variations in this rate have a minor direct impact on the nucleosynthesis of elements up to the iron peak. Instead, the primary effect is structural, as a more efficient rate alters, for example, the convective core mass and stellar compactness. In this talk, I will discuss how a more efficient 12C+12C fusion impacts the final structure of the star and, in turn, influences the chemical composition of the supernova ejecta, dominating over the nuances of the chosen explosion mechanism.