Physics – Nuclear Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dnp.cc012m&link_type=abstract
American Physical Society, Division of Nuclear Physics Meeting, 27-30 October, 2004, Chicago, IL. MEETING ID: DNP04., abstract #
Physics
Nuclear Physics
Scientific paper
The triple-alpha process and the ^12C radiative capture of an alpha particle are the most important reactions during helium stellar burning. The relative rates of these reactions determine the ^12C/^16O abundance ratio at the end of helium burning and beyond. Extrapolating the ^12C(α,γ)^16O cross section to low energies has been a longstanding problem in nuclear astrophysics. Ground-state transitions make the most contributions to the total cross section while cascade transitions have contributions of the order of 10-20%. Determining the 7.12arrow6.92-MeV branching ratio will result in a better extrapolation of both cascade and ground-state transitions to low energies. The 7.12-MeV excited state in ^16O is formed by the ^19F(p,αγ)^16O reaction by bombarding targets of CaF2 at the 4.5 MV Tandem Van de Graaff Accelerator at Ohio University. We report here on measurements on the branching ratio of the 7.12arrow6.92-MeV transition in ^16O.
Brune Carl R.
Matei Catalin
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