Valence capture mechanism in resonance neutron capture byC13

The partial radiation widths of three (two electric dipole and one electric quadrupole) primary γ transitions in ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$, subsequent to neutron capture by the 153-keV, $2^{+}$ resonance in ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$, have been remeasured. Both electric dipole transitions, accounting for more than 80% of the total radiation width, can be explained as valence neutron transitions. The deduced total radiation width of ${0.215}_{\mathrm{-}0.035}^{+0.084\mathrm{}}$ eV for this resonance disagrees with the previous value of 2.4±0.9 eV and significantly affects the production of A≥14 nuclei in primordial nucleosynthesis.