TheC12(α,γ)O16reaction and its implications for stellar helium burning
The ${}^{12}$C(\ensuremath{\alpha},\ensuremath{\gamma})${}^{16}$O reaction is essential for the the production of carbon and oxygen in the Universe, and also for the composition of stellar cores after helium burning, a key determinant for supernova explosions. This review summarizes the current experimental understanding, theoretical underpinning, and the interpretation of reaction data for this critical reaction. It is shown that the desired level of uncertainty, \ensuremath{\approx}10%, may be in sight, but several inconsistencies need to be overcome. Ways to move forward beyond the state of the art are discussed.