Abstract
The spectrum of low energy beta-delayed alpha-particle emission of $^{16}\mathrm{N}$ was measured with high sensitivity; e.g., at ${\mathit{E}}_{\mathrm{\ensuremath{\alpha}}}^{\mathit{L}}$\ensuremath{\approxeq}1 MeV, a sensitivity for a beta-decay branching ratio in the range of ${10}^{\mathrm{\ensuremath{-}}9}$ (to ${10}^{\mathrm{\ensuremath{-}}10}$) was achieved. We used previous theoretical work of Ji, Filippone, Humblet, and Koonin to extract from these data the astrophysical p-wave S factor for the $^{12}\mathrm{C}$ (\ensuremath{\alpha},\ensuremath{\gamma}${)}^{16}$O capture reaction, and find ${\mathit{S}}_{\mathit{E}1}$(300)=95\ifmmode\pm\else\textpm\fi{}6(stat)\ifmmode\pm\else\textpm\fi{}28(syst) keV b. This result is crucial, for example, for understanding the last stages of a massive star before a supernova.
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