[en] Radiative alph-capture by ¹²C is a key process occurring during the helium-burning phase in red giant stars, and its rate remains one of the most significant uncertainties in the nucleo-synthetic calculations for massive stars. This is largely due to the lack of precise experimental information concerning the values of the reduced α-particle widths of the Jπ 1^- and 2⁺ sub-thresold states in ¹⁶0 to which the higher-energy capture data are only weakly sensitive. Of these two states, the reduced α-width of the E_x=7.12 MeV J^π = 1^- level has been predicted to have a considerable effect on the structure of the hitherto unmeasured low-energy region of ^beta^-delayed ^alpha^-particle spectum of ¹⁶N. Experiments using the TRIUMF isotope separator TISOL have been performed to measure this α--spectrumdown to an energy of E^α=600 keV, utilizing a coincidence technique which also accounts completely for the detector response function. The α-spectrum, containing 10⁶ counts, has been incorporated into both R- and K-matrix analyses along with the previously measured ¹²C(α, γ)¹⁶0 cross section and the ¹²C + α elastic phase shifts to yield a much improved value for S_E1(300) keV. In light of this new determinatin of S_E1(300), the available radiative capture data and elastic scattering phase shifts are re-analysed, along with β-delayed α-spectrum of ¹⁶N in an attempt also to place improved limits on the S_E1(300) contribution to the ¹²C(α, γ)¹⁶0 cross section. (author)