Abstract
Studies of nuclei far off the line of stability are one of the main topics in nuclear structure physics. The search for states with spatially extended low-density matter distributions, so-called “halos”, found predominantly in light neutron-rich nuclei is of central importance. Halo-breakup experiments were performed in complete kinematics with relativistic secondary beams of energies of 0.2–0.4 GeV/u at GSl. For the examples of the two-neutron halo nuclei 6He and 11Li results of angular, energy and momentum correlation measurements after breakup into a core fragment and valence neutrons are given and single-particle ground-state properties and large low-lying multipole strength near the threshold for particle emission will be discussed.
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