Spectroscopic factor strengths using ab ~ initio approaches

We have calculated the spectroscopic factor strengths for the one-proton and one-neutron pick-up reactions $^{27}$Al($d$,$^{3}$He)$^{26}$Mg and $^{27}$Al($d$,$t$)$^{26}$Al within the framework of the shell model. We employed two different $ab ~ initio$ approaches : an in-medium similarity renormalization targeted for a particular nucleus, and the coupled- cluster effective interaction. We also compared our results with recently determined experimental spectroscopic factors.