By choosing appropriate generators for the Similarity Renormalization Group (SRG) flow equations, different patterns of decoupling in a Hamiltonian can be achieved. Sharp and smooth block-diagonal forms of phase-shift equivalent nucleon-nucleon potentials in momentum space are generated as examples and compared to analogous low-momentum interactions (“$V_{\mathrm{low}k}$”).

• Received 14 January 2008

DOI:https://doi.org/10.1103/PhysRevC.77.037001