Spectroscopic factor calculations in the ab initio no-core shell model

The convergence properties of spectroscopic factors in the ab initio no-core shell model are hereby investigated. For this, we consider nuclear energies and spectroscopic factors in A = 6 and 7 isotopes, using the chiral forces NNLOopt and N3LO. While low-lying spectrum energy demonstrates remarkable convergence with the increase of model space within the no-core shell model, the spectroscopic factor exhibits no definitive convergence trend and seems independent of the employed nuclear interaction. The use of spectroscopic factors issued from the no-core shell model to calculate cross sections of knockout reactions might then be questionable. The results are compared with that of the standard shell model and ab initio Monte Carlo calculations.