We present new improved $R$ matrix fits of direct data and indirect Trojan Horse data for the ${}^{15}\mathrm{N}(p,\alpha ){}^{12}\mathrm{C}$ reaction and provide a more accurate recommended value of $S(0)=73.0\pm 5.0$ MeV b from direct Redder data [A. Redder et al., Z. Phys. A 305, 325 (1982)] and $S(0)=70.0\pm 13.5$ MeV b from the Trojan Horse data [M. La Cognata et al., Phys. Rev. C 76, 065804 (2007)]. We also analyze a recent fit by Barker [F. C. Barker, Phys. Rev. C 78, 044611 (2008)] and demonstrate that when all the uncertainties are taken into account, our results overlap with his. We also provide a fit of the Trojan Horse data that properly takes into account finite residual energy resolution of the data.

• Received 13 April 2009

DOI:https://doi.org/10.1103/PhysRevC.80.012801