The inclusion of tensor terms in the nonrelativistic nuclear energy density functionals

This contribution is intended to briefly review recent attempts to include tensor terms in effective nuclear Energy Density Functionals (EDFs). We stress that effective tensor forces should not be conflused with the well-known bare tensor force. Consistently with the basic idea of EDFs, collective states are shown to provide better constraints for the tensor parameters, as compared with single-particle states. In fact, basic limitations of the description of the single-particle strength in atomic nuclei provided by EDFs, are highlighted in the last part of this contribution.