Resonant and average behavior of theC12+C

Synthesis of the elements in stars: forty years of progress

“…Numerous other studies of the 12 C+ 12 C reactions have since been published (Dayras et al, 1977;Mazarakis and Stephens, 1972;High and Cujec, 1977;Kettner et al, 1980;Erb et al, 1980;Becker et al 1981). The most striking revelation of these studies is that the yield vs energy curve (''excitation function'') displays a strongly resonant structure, the origin of which remains obscure, notwithstanding many suggestions regarding this intermediate structure (see Fig.…”

Origin and Consequences ofC12+C12Fusion Resonances at Deep Sub-barrier Energies

“…Almqvist et al [14] suggested that the resonance structure observed in 12 C+ 12 C may be due to the low excitation energy available in the 24 Mg system, but Erb et al (from the same collaboration, [15]) concluded that, apart from the narrow resonances, the average energy dependence of the 12 C+ 12 C system can be described adequately by the IWBC model calculations of Christensen et al [16]. However, in this case, no attempt was made to simultaneously reproduce the excitation functions for all three C+C systems in a self-consistent manner.…”

Sub-barrier fusion cross section measurements with STELLA

“…Alongside to the use of high intensity beams up to 10 µA and compacted detector configurations 12 C fusion is detected via the coincident measurement of evaporation products and de-excitation gammas [3] from daughter nuclei of the 24 Mg compound. In the 12 C + 12 C system the reaction channels, that include light charged particles, are (1) and (2) predominantly cascades through the first excited states of the daughter nuclei [4]. Alongside with the measurement of the corresponding particle energies the detection of the characteristic gamma lines at 440 keV and 1634 keV, respectively, is targeted in the first instance.…”