In the transitional mass range (~8–10 solar masses) between white dwarf formation and iron core-collapse supernovae, stars are expected to produce an electron-capture supernova. Theoretically, these progenitors thought be super-asymptotic giant branch with a degenerate O + Ne Mg core, electron capture onto nuclei should initiate core collapse1–4. However, no supernovae have unequivocally been i...

Interatomic Coulombic electron capture (ICEC) is an environment-assisted process in which a free can efficiently attach to quantum system by transferring the excess energy of neighbor ionizing it. Using ab initio $R$-matrix method, we show that Fano profiles, resulting from interferences between ICEC final states and resonant states, appear cross sections even at extremely large system-neighbor...