Abstract
The fusion reaction $^{12}\mathrm{C}(^{12}\mathrm{C},\mathrm{p})^{23}\mathrm{Na}$ has been studied from $E=2.00$ to 4.00 MeV by particle spectroscopy. The data reveal broad resonances above $E=3.00$ MeV and are compatible with previously reported resonance structure around $E=2.1$ MeV. The data were limited at low energies by low count rates as well as possible background contributions. This experiment extends the previously achieved low-energy measurement by charged particle spectroscopy to 2 MeV, which corresponds to the high-energy side of the astrophysically relevant temperature. Present knowledge of level structures and nonresonant contribution cannot explain the results of the present experiment, which may change the $^{12}\mathrm{C}+^{12}\mathrm{C}$ reaction rate significantly. Despite the progress decreasing the low-energy limit, any extrapolation into the astrophysical energy range remains highly uncertain based on available experimental data.
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