The spectrum of low energy beta-delayed alpha-particle emission of ,6 N was measured with high sensitivity; e.g., at £a«l MeV, a sensitivity for a beta-decay branching ratio in the range of 10 ~9 (to 10 ~1 0 ) 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 C(a,y) 16 0 capture reaction, and find SfiOOO) =95 ± 16(stat) ± 28(syst) keVb. This result is crucial, for example, for understanding the last stages of a massive star before a supernova. PACS numbers: 23.60.+e, 25.55.Ci, 27.20.+n, 95.30.Cq

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