  Properties of finite nuclei are evaluated with two-nucleon (NN) and
three-nucleon (NNN) interactions derived within chiral effective field theory
(EFT). The nuclear Hamiltonian is fixed by properties of the A=2 system, except
for two low-energy constants (LECs) that parameterize the short range NNN
interaction. We constrain those two LECs by a fit to the A=3 system binding
energy and investigate sensitivity of 4He, 6Li, 10,11B and 12,13C properties to
the variation of the constrained LECs. We identify a preferred choice that
gives globally the best description. We demonstrate that the NNN interaction
terms significantly improve the binding energies and spectra of mid-p-shell
nuclei not just with the preferred choice of the LECs but even within a wide
range of the constrained LECs. At the same time, we find that a very high
quality description of these nuclei requires further improvements to the chiral
Hamiltonian.
