Extending the No Core Shell Model to heavier mass nuclei

The No Core Shell Model (NCSM) is an ab initio method for calculating the properties of light nuclei, up to about A=20, in which all A nucleons are treated as being active and interacting through realistic nucleon-nucleon (NN) and three-nucleon (NNN) forces. It is difficult to go to larger A values due to the rapid growth of the basis spaces required in order to obtain converged results. In this talk we discuss three techniques, still in development, for extending the NCSM to heavier mass nuclei.