Study of binary reaction channels in the $^{24}$Mg + $^{12}$C collision
Résumé
The study of $\gamma$-decays in $^{24}$Mg$^{*}$ is presented for excitation energies between the $\alpha$+$^{20}$Ne (9.3 MeV) and $^{12}$C+$^{12}$C (13.9 MeV) thresholds, where molecular resonances have been observed in $^{12}$C+$^{12}$C collisions. Various theoretical predictions exist for the occurence of superdeformed and hyperdeformed bands which can partially be identified with known resonance structures correlated in several reaction channels, and for which low spin members are predicted within the measured $^{24}$Mg$^{*}$ excitation energy region. The inverse kinematics reaction $^{24}$Mg$+^{12}$C has been investigated at E$_{lab}$($^{24}$Mg) = 130 MeV, an energy which enable the population of $^{24}$Mg states decaying into $^{12}$C+$^{12}$C resonant breakup states. Exclusive data were collected with the Binary Reaction Spetrometer (BRS) in coincidence with EUROBALL installed at the VIVITRON Tandem facility of the IReS at Strasbourg. Specific structures with large deformation were selectively populated in binary reactions and their $\gamma$-decays determined by using the BRS as a master trigger. Coincident events with inelastic as well as with binary $\alpha$-transfer channels have been selected by choosing the excitation energy or the entry point via the two-body Q-values. The analysis of the binary and quasi-binary reaction channels is presented with a particular emphasis on the $^{24}$Mg-$\gamma$ and $^{20}$Ne-$\gamma$ coincidences as well as the $^{12}$C-$^{12}$C coincidences.