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Single nucleon knockout and quasi-free scattering reactions are valuable tools to study singleparticle properties of nuclei. Particularly, it has been argued, that they can be used to study spectroscopic factors on an absolute scale. Quenching of these spectroscopic factors as compared to shell-model predictions has been observed in nuclear knockout reactions. While for stable isotopes these findings are in agreement with results obtained in quasi-free electron scattering, a surprisingly large dependancy of this quenching on the neutron-proton asymmetry has been observed, motivating further studies using quasi-free proton scattering. Quasi-free scattering of both stable and exotic light nuclei has been studied in inverse kinematics at GSI. While in a first protoype experiment a 12C beam was accelerated to 500AMeV by the SIS18 heavy ion synchrotron, in a second experiment mixed secondary beams created by impinging 40Ar on a production target at the entrance of the fragment separator FRS were used. In both cases, the incoming beam as well as all reaction products were detected in kinematically complete measurements at the R3B-LAND setup. Results for cross sections, spectroscopic factors and momentum distributions will be shown for different carbon and oxygen isotopes and compared to results obtained for knockout reactions as well as DWIA-calculations. Furthermore, excitation spectra of the reaction products will be discussed.

Quasi-Free Scattering from Relativistic Carbon and Oxygen Isotopes