Measurement of the Cascade Transition via the First Excited State of O16 in the C12(α,γ)O16 Reaction, and Its S Factor in Stellar Helium Burning

Details Measurement of the Cascade Transition via the First Excited State of O16 in the C12(α,γ)O16 Reaction, and Its S Factor in Stellar Helium Burning Measurement of the Cascade Transition via the First Excited State of O16 in the C12(α,γ)O16 Reaction, and Its S Factor in Stellar Helium Burning

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvl..97x2503m&link_type=abstract

Physical Review Letters, vol. 97, Issue 24, id. 242503

Other

21

Other Resonances, Radiative Capture, Resonance Reactions, Hydrostatic Stellar Nucleosynthesis

Scientific paper

Radiative α-particle capture into the first excited, Jπ=0+ state of O16 at 6.049 MeV excitation energy has rarely been discussed as contributing to the C12(α,γ)O16 reaction cross section due to experimental difficulties in observing this transition. We report here measurements of this radiative capture in C12(α,γ)O16 for center-of-mass energies of E=2.22MeV to 5.42 MeV at the DRAGON recoil separator. To determine cross sections, the acceptance of the recoil separator has been simulated in GEANT as well as measured directly. The transition strength between resonances has been identified in R-matrix fits as resulting both from E2 contributions as well as E1 radiative capture. Details of the extrapolation of the total cross section to low energies are then discussed [S6.0(300)=25-15+16keVb] showing that this transition is likely the most important cascade contribution for C12(α,γ)O16.

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