Forbidden electron capture on ${}^{24}$Na and ${}^{27}$Al in degenerate oxygen-neon cores

D. F. Strömberg, G. Martínez-Pinedo, F. Nowacki

Stars with an initial mass of $\sim 7$-11 solar masses form degenerate oxygen-neon cores following carbon burning. Electron captures in such cores can trigger runaway oxygen burnin…