Phys. Rev. C 76, 065804 (2007) [15 pages]Astrophysical S(E) factor of the 15N(p,α)12C reaction at sub-Coulomb energies via the Trojan horse methodReceived 6 March 2007; revised 10 August 2007; published 28 December 2007 The low-energy bare-nucleus cross section for 15N(p,α)12C is extracted by means of the Trojan horse method applied to the 2H(15N,α12C)n reaction at Ebeam=60 MeV. For the first time we applied the modified half-off-energy-shell resonant R-matrix method that takes into account off-energy-shell effects and initial- and final-state interactions. In particular it has been shown that inclusion of Coulomb 15N-d scattering and off-shell effects do not affect the determination of the astrophysical factor. Also the simple plane-wave approximation used in previous analyses is justified. The results extracted via the Trojan horse method are compared to direct data in the same energy region and show very good agreement in the energy interval 70–312 keV. These results confirm the extrapolations of the S factor reported in literature. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.76.065804
DOI:
10.1103/PhysRevC.76.065804
PACS:
24.10.-i, 26.20.+f, 25.40.Hs, 27.20.+n
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