Heavy ion fusion reactions far below barrier and their astrophysical implications

Fusion reactions between heavy nuclei have been an hot topic in nuclear physics since the first experiments took place in the 80s: amidst the plethora of subjects involved, the study of low energy collision dynamics is one of the most prolific and interesting fields of study, especially because of its tight connection with stellar thermonuclear processes. In this context, the experimental work presented in this thesis aims to extend the current knowledge about fusion between medium-light nuclei at energies far below the Coulomb barrier, particularly looking for the hindrance phenomenon. The investigation of medium-light systems helps understanding the behaviour of the lighter ones, especially the processes of carbon and oxygen burning in the late stages of star evolution. This thesis work consists of the experimental study of such medium-light systems, involving 12C and heavier nuclei like 24-26Mg and 28Si, more specifically the fusion reaction 12C+26Mg. The measured cross sections are discussed and compared to the predictions of current theoretical models.