A new ¹²C + ¹²C nuclear reaction rate: Impact on stellar evolution

This work presents new $^{12}$C + reaction rates in the form of numerical tables with associated uncertainty estimation, as well analytical formulae that can be directly implemented into stellar evolution codes. article further describes impact these on C-burning stars. We determine for two cross-section extrapolation models: one based fusion-hindrance phenomenon, and other plus a resonance, compare our results to previous data. Using GENEC code, we study how phases sets models stars 12 M$_{\odot}$ 25 initial masses chosen highly representative diversity massive The effective temperatures both are entirely covered by sensitivity present experimental data, no is required. Although, may differ more than an order magnitude typical C-burning, impacts structures during phase remain modest. consequence readjustment structure change nuclear rate reactions important energy production. For hindrance case, found occur at central 10\% higher resonance rate. Its lifetime reduced factor two. model, nevertheless, loses entropy thus enters earlier degeneracy regime which will last stages pre-core collapse time. model produces up 60% neon. different s-process occurring modest, changing final abundances s-processed elements most 20% (cobalt).