Direct measurement of the 14N(p,g)15O S-factor

Details Direct measurement of the 14N(p,g)15O S-factor Direct measurement of the 14N(p,g)15O S-factor

2004-08-17

arxiv.org/abs/nucl-ex/0408018v1

Phys.Rev.Lett. 94 (2005) 082503

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.082503

We have measured the 14N(p,g)15O excitation function for energies in the range E_p = 155--524 keV. Fits of these data using R-matrix theory yield a value for the S-factor at zero energy of 1.64(17) keV b, which is significantly smaller than the result of a previous direct measurement. The corresponding reduction in the stellar reaction rate for 14N(p,g)15O has a number of interesting consequences, including an impact on estimates for the age of the Galaxy derived from globular clusters.

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