The key reactions in Stellar helium burning: 12C(α,γ)16O and 22Ne(α,n)25Mg

Details The key reactions in Stellar helium burning: 12C(α,γ)16O and 22Ne(α,n)25Mg The key reactions in Stellar helium burning: 12C(α,γ)16O and 22Ne(α,n)25Mg

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nupha.718..131f&link_type=abstract

Nuclear Physics A, Volume 718, p. 131-134.

Physics

Nuclear Physics

1

Scientific paper

The excitation functions of 12C(α,γ)16O and 22Ne(α,n)25Mg have been determined with a yet unequaled experimental sensitivity of 10-11 b. From γ-angular distributions the SE1-and SE2-factors for 12C(α,γ)16O have been deduced and extrapolated into the range of helium burning temperatures using the R-matrix method. An improved reaction rate has been calculated: NA<σν>=(7.9+/-2.5)x10-15cm3(mols)-1 at T9 = 0.2. For a more precise extrapolation the excitation function has to be measured with better statistics. Therefore a new experiment on 12C(α,γ)16O with a better suited setup has been started recently.
The accuracy of the 22Ne(α,n)25Mg reaction rate could be improved considerably compared to previous compilations: NA<σν> = (0.88-0.3+2.6) x 10-16cm3(mols)-1 at T9 = 0.2.

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