Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012phrvc..85d5804d&link_type=abstract
Physical Review C, vol. 85, Issue 4, id. 045804
Astronomy and Astrophysics
Astrophysics
Stellar Helium Burning, Stellar Hydrogen Burning, Elastic And Inelastic Scattering, Transfer Reactions
Scientific paper
Background: Reactions that probe the compound nucleus structure of 16O near the α and proton separation energies have important implications for nuclear astrophysics. New, more sensitive measurements of the reaction 15N(p,γ)16O have motivated the need for improved compound-nucleus reaction data in other channels. A previous work [P. Tischhauser , Phys. Rev. C 79, 055803 (2009)] reported extensive α-scattering data over the energy region from Eα=2.6 to Eα=6.6 MeV. During this experiment data for higher energies, from Eα=6.6 to Eα=8.2 MeV, were also recorded but were not analyzed. The unpublished data cover the excitation energy range from the proton separation energy at Ex = 12.13 MeV up to 13.31 MeV, the same energy range important for the reaction 15N(p,γ)16O.Purpose: These previously unpublished data for 12C(α,α)12C as well as the reactions 12C(α,α1)12C and 12C(α,p)15N are analyzed in order to provide additional data for a comprehensive R-matrix analysis of compound-nucleus reactions populating 16O.Methods: Expanding on the previous publication's analysis, the ratio of the reaction yields was analyzed using a multiple-channel R-matrix calculation.Results: The excitation curves resolved resonances at Eα (Jπ)=7.05(1‑), 7.75 (2+), 7.91 (1‑), 7.97 (3‑), and 8.13 (3‑) MeV. The R-matrix analysis revealed excellent agreement between the measured yield ratios and cross-section data from the literature. The two 1‑ levels at Eα=7.05 and 7.91 MeV are those that dominate the 15N(p,γ)16O cross section.Conclusions: In a future publication, the additional constraints provided by these data will be used in a comprehensive multiple-channel R-matrix analysis to investigate the low-energy cross section of the reaction 15N(p,γ)16O.
Azuma R. E.
Couture Aaron
deBoer R. J.
Detwiler R.
Görres Joachim
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