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The coexistence of single-particle and collective degrees of freedom in atomic nuclei gives rise to various exotic phenomena. In nuclei with very asymmetric proton-to-neutron ratios, the strong nuclear interaction drives shell evolution which alters the orbital spacing, and in some cases even the ordering present in stable nuclei. Such changes in the structure can have profound consequences for structure and dynamics of nuclei as well as the synthesis of elements in the universe.
In-beam gamma-ray spectroscopy with relativistic beams is an excellent tool to study the structure of the most exotic nuclei in the laboratory. In this talk, I will give an overview of the experimental method and present some recent results from the HiCARI project addressing collective and single-particle structure of nuclei very far from stability by lifetime measurements. I will also discuss further prospects to enhance the sensitivity of the experimental method for future physics experiments at FAIR. The LISA (LIfetime measurements with Solid Active targets) project is based on active solid targets and will dramatically enhance the scope of measurements of excited-state lifetimes and thus transition probabilities achievable in exotic nuclei.
J.J. Valiente Dobón