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The 14N(p,γ)15O low-energy S-factor

✍ Scribed by C. Angulo; P. Descouvemont

Book ID: 104334015
Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 176 KB
Volume: 690
Category: Article
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(00)00696-5

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✦ Synopsis

The 14 N(p,γ ) 15 O low-energy S-factor is analyzed using the R-matrix model. We find that the g.s. contribution is less than previously reported. The S-factor is mainly given by the 6.79 MeV state contribution which is determined by its asymptotic normalization constant (ANC). Consequently, the S-factor at zero energy is lower by a factor of 1.7 compared to the values given in recent compilations. This result may affect the nucleosynthesis and time scale evolution in massive stars. New measurements of the 14 N(p,γ ) 15 O cross section over a wide energy range, and especially at low energies, are highly desirable. Significant improvement could be also obtained from the ANC measurement of the 6.79 MeV state.

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