Abstract
The fusion excitation function for the positive-Q-value system 12 C+30 Si (Qfus = +14.1 MeV) has been measured in inverse kinematics down to the μ b level and compared with standard coupled-channel calculations. The appearance of the fusion hindrance phenomenon and the evidence of a S-factor maximum have been observed. This result can be significant to extrapolate the behavior of lighter astrophysical relevant systems at deep sub-barrier energies, where existing experimental data are still contradicting and affected by large errors.
Highlights
Fusion reactions between light heavy ions have a prominent role in the dynamical stellar evolution
To account for a possible contamination from higher-mass carbon isotopes, some points were measured with a 13C target and used to correct the plotted cross sections
Though the quite large error bars, one can clearly notice a crossing of the LCS(E) function, which was introduced in Sect. 2, as well as the appearance of a maximum of the S factor around E = 10.5 MeV. This can be taken as a confirmation of the onset of hindrance for this positive Q-value system. In this contribution we have described the measurement of the fusion excitation function for the positive Q-value system 12C+30Si in inverse kinematics, performed at the INFN Laboratori Nazionali of Legnaro
Summary
Fusion reactions between light heavy ions have a prominent role in the dynamical stellar evolution. If the S factor develops a maximum, the fusion cross sections and the reaction rates in stars at the lower energies important for astrophysics will be substantially lower than what predicted by simple extrapolations of the high-energy trends, where sets of measurements already exist. In this contribution we will present the preliminary results of a measurement performed at the Laboratori Nazionali of Legnaro of INFN where the excitation function for the system 12C+30Si was measured down to the deep sub-barrier energy regime. Factor maximum, which would be a relevant clue to deduce the behavior of astrophysical relevant systems
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