Nuclear Structure of $12C$ from Break‐up Studies in Complete Kinematics

A complete kinematics study of the $10B(3He,pααα)$ and $11B(3He,dααα)$ reactions has been performed to study the multi‐particle break‐up of $12C$ resonances above the triple‐alpha threshold. Four‐particle coincidence detection gives us complete information on the direction and energy of the individual alpha particles from the decay of $12C,$ allowing us to extract new information on the structure of $12C$ which we shall present in this contribution. We have observed gamma de‐excitation of the $T = 1$ 15.11 MeV resonance using charged particle detectors, and have constructed Dalitz plots of the individual resonances in $12C$ using the complete kinematics information of the alpha particles which come from their break‐up.