Towards Ab-Initio Nuclear Structure Calculations Beyond the p-Shell

Recent developments in modern nuclear structure theory regarding the construction of phase-shift equivalent effective interactions and their use in ab initio calculations are discussed. Two methods for the construction of tamed interactions via unitary transformations are reviewed and compared: the Unitary Correlation Operator Method and the Similarity Renormalization Group. Furthermore, we present a simple importance truncation scheme within the no-core shell model, which gives access to nuclei well beyond the p-shell. Using the interactions discussed before, we show results for ground-state energies of closed-shell nuclei up to 40Ca.