The Exponential S-Factor in the PP Chain

Details The Exponential S-Factor in the PP Chain The Exponential S-Factor in the PP Chain

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..847..506y&link_type=abstract

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: International Symposium on Origin of Matter and Evolution of Galaxies 2005: New Hori

Astronomy and Astrophysics

Astrophysics

Solar Interior, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Fundamental Aspects Of Astrophysics

Scientific paper

The astrophysical S-factor widely used in the literature is a linear or a second order polynomial fit in terms of energy. In this work, we assume an exponential form of the S-factor. The S-factor can then be written in the form lnS0 + f(E) where S0 = 5.523 MeV and f(E) = ax + bx2 + cx3. By fitting the experimental cross section for He3 - He3, we obtain a = -0.88, b = 0.59 and c = -0.11. We evolve a solar model and compare with those of the standard cross section compilation. Most of the physical and chemical profiles differ at most by a few percent but the He3 abundance is higher by 20 %. This might affect the Be7 and B8 neutrino productions.

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