Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvc..78f5801m&link_type=abstract
Physical Review C, vol. 78, Issue 6, id. 065801
Physics
3
3H-, 3He-, And 4He-Induced Reactions, 6<=A<=19, Hydrostatic Stellar Nucleosynthesis, X- And Gamma-Ray Spectroscopy
Scientific paper
Gamma-ray branching ratios of the 7.12-MeV state in O16 have been measured using the γ-γ coincidence technique. The extrapolations of several components of the important C12(α,γ)O16 cross section to helium-burning energies are dependent upon the 7.12→6.92 MeV branching ratio. An experimental upper limit has been placed on this transition; the 7.12→6.13 MeV branching ratio has also been measured. Relative cross sections and γ-ray angular distributions have been measured for the F19(p,αγ) reaction at several energies near Ep=2 MeV, leading to the 6.13-, 6.92-, and 7.12-MeV states of O16. Monte Carlo simulations of the various detectors have been developed and the simulated detector efficiencies have been compared and adjusted to experimental measurements. The available experimental data relating to the C12(α,γ)O16 cross section have been fitted with the R-matrix formalism. The new upper limit on the 7.12→6.92 MeV branching ratio impacts the extrapolation of both the E2 ground-state cross section and the cascade cross section through the 6.92-MeV state.
Brune Carl R.
Massey T. N.
Matei Catalin
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