Two key reactions in stellar nucleosynthesis: 12C(α,γ)16O and 22Ne(α,n)25Mg

Details Two key reactions in stellar nucleosynthesis: 12C(α,γ)16O and 22Ne(α,n)25Mg Two key reactions in stellar nucleosynthesis: 12C(α,γ)16O and 22Ne(α,n)25Mg

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nuas.conf...67h&link_type=abstract

"In: Proceedings of the 11th Workshop on "Nuclear Astrophysics", Ringberg Castle, Tegernsee, Germany, February 11-16, 2002 / Wol

Astronomy and Astrophysics

Astrophysics

1

Stars, Nuclear Reactions, Nucleosynthesis

Scientific paper

The excitation functions of the key reactions of stellar nucleosynthesis, 12C(α,γ)16O and 22Ne(α,n)25Mg, have been determined with an experimental sensitivity of 10-11 barn. For 12C(α,γ)16O the SE1- and SE2-factors deduced from the γ angular distributions have been extrapolated into the range of helium burning temperatures applying the R-matrix method, which yielded S300E1 = (76+/-20) keV b and S300E2 = (85+/-30) keV b. Based on the new data, improved reaction rates were calculated as a function of temperature. For 12C(α,γ)16O the reaction rate at T9 = 0.2 is NA<σv> = (7.9+/-2.5)×10-15 cm3(mol s)-1 and for 22Ne(α,n)25Mg it is NA<σv> = 0.88(+2.6, -0.3)×10-16 cm3(mol s)-1, improving the accuracy considerably compared to previous determinations.

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