  We present ab initio predictions for ground and excited states of doubly
open-shell fluorine and neon isotopes based on chiral two- and three-nucleon
interactions. We use the in-medium similarity renormalization group, in both
flow-equation and Magnus formulations, to derive mass-dependent sd
valence-space Hamiltonians. The experimental ground-state energies are
reproduced through neutron number N=14, beyond which a new targeted
normal-ordering procedure improves agreement with data and large-scale
multi-reference calculations. For spectroscopy, we focus on neutron-rich 23-26F
and 24-26Ne isotopes near N=14,16 magic numbers. In all cases we find an
agreement with experiment competitive with established phenomenology. Moreover,
yrast states are well described in 20Ne and 24Mg, providing an ab initio
description of deformation in the medium-mass region.
