Physical interpretation of astrophysical factor S(E) for stellar energies from the WKB approximation.

Details Physical interpretation of astrophysical factor S(E) for stellar energies from the WKB approximation. Physical interpretation of astrophysical factor S(E) for stellar energies from the WKB approximation.

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999crasb.327..251b&link_type=abstract

Comptes Rendus de l'Academie des Sciences, Sér. II, Fasc. b, Tome 327, No. 2 - 3, p. 251 - 258

Astronomy and Astrophysics

Astrophysics

Nuclear Reactions: Nucleosynthesis

Scientific paper

For "non-resonant" reactions, a physical interpretation of the astrophysical factor S(E) in terms of the Coulomb barrier penetration factor and an intrinsic nuclear factor is proposed. Using the WKB (Wentzel, Kramers, Brillouin) approximation to evaluate the penetrabilities at stellar energies, the authors point out a drastic difference between the absolute values if S(0) according to wether s or p waves dominate the reaction. The variation with energy of S(E) to first order can also sign the nature of the wave. An application for the 6Li(d,α)4He and 7Li(p,α)4He reactions is presented.

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