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Abstract
The total cross sections of the 12C+16O fusion have been experimentally determined at low energies to investigate the role of this reaction during late stellar evolution burning phases. A high-intensity oxygen beam was produced by the 5MV pelletron accelerator at the University of Notre Dame impinging on a thick ultra-pure graphite target. Protons and γ-rays were measured simultaneously in the center-of-mass energy range from 3.64 to 5.01 MeV, using strip silicon and HPGe detectors. Statistical model calculations were employed to interpret the experimental results. A new broad resonance-like structure is observed for the 12C+16O reaction, and a decreasing trend of its S-factor towards low energies is found.
Highlights
The 12C+16O reaction is widely considered to play a critical role in early stellar evolution, in explosive carbon burning and explosive and hydrostatic oxygen burning[1, 2]
The data was collected by ASIC (Application Specific Integrated Circuit) data acquisition system at Nuclear Science Laboratory (NSL)
An advantage of current measurement is that coincidence between protons and γ rays can be performed
Summary
The 12C+16O reaction is widely considered to play a critical role in early stellar evolution, in explosive carbon burning and explosive and hydrostatic oxygen burning[1, 2]. The cross section of the fusion is governed by possibilities of penetrating through the Coulomb Barrier, and it rapidly drops when the reaction energy decreases under the barrier. This results to extremely low cross section values near and within its astrophysical interested energies, the direct experimental measurement at stellar energies is always difficult.
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