A new study for 16O(γ,α)C at the energies of nuclear astrophysics interest: The inverse of key nucleosynthesis reaction 12C(α,γ)O

Details A new study for 16O(γ,α)C at the energies of nuclear astrophysics interest: The inverse of key nucleosynthesis reaction 12C(α,γ)O A new study for 16O(γ,α)C at the energies of nuclear astrophysics interest: The inverse of key nucleosynthesis reaction 12C(α,γ)O

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007nimpa.581..866x&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 581, Issue 3, p. 866-873.

Physics

3

Scientific paper

The key reaction 12C(α,γ)O in nuclear astrophysics is difficult to be performed experimentally at low energy because of the Coulomb barrier. But it is different if we use its inverse reaction 16O(γ,α)C because the cross-section of 16O(γ,α)C is almost 100 times larger than the cross-section of 12C(α,γ)O at the same center of mass energy (E) based on our study. In the present work, we study the angular distributions and total cross-sections of 16O(γ,α)C which are induced by polarized photon using the resonance theory of low energy reaction. The differential cross-sections as well as E1 and E2 transition cross-sections at low nuclear astrophysics energies are also calculated. The feature of the future Shanghai Laser Electron Gamma Source (SLEGS) facility, a low energy γ-ray beam line with a high photon flux, is presented. The experiments of 16O(γ,α)C are simulated with a time projection chamber (TPC) and a realistic SLEGS layout. The lowest (E), which can be obtained from the simulation, is 0.8 MeV with the 20 30% uncertainty for the one-month beam time of SLEGS. The extracted S factors of 12C(α,γ)O and their statistical uncertainties from the simulation are compared with the existing data and some theoretical calculations. It is shown that the promising 16O(γ,α)C experiment at SLEGS can largely reduce the statistical uncertainties of the 12C(α,γ)O experiment at low energies.

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