Structure of $p$-shell Nuclei with Interactions Derived from Chiral Effective-Field Theory*

Traditional realistic nucleon-nucleon (NN) interactions based on precision fits to 2-body data have not produced high-quality descriptions of light nuclei. Effective-Field theories (EFT) based on chiral-perturbation theory provide a natural scheme to derive inter-nucleon interactions and predict a three-nucleon interaction at next-to-next-to-leading order (N2LO). A key feature of these EFT potentials is a set of parameters; some of which are determined by the EFT NN couplings, while others are chosen to reproduce the binding energies of A=3 and 4 nuclei. We have developed the tools to utilize EFT-based potentials, including the NNN terms, in the ab initio no-core shell model (NCSM). We have also improved our shell-model codes to increase the scope of our calculations with three-nucleon interactions to the point where model spaces up to $6 \hbar\Omega$ are accessible for all $p$-shell nuclei. We will show results of large-basis NCSM calculations for light p-shell nuclei, especially masses $A =10, 11, 12, 13$ and highlight the impact the N2LO TNI and its parameters on their structure. Support from LDRD contract No. 04-ERD-058 and DOE grant SCW0498 is acknowledged.