Ab initio shell model calculations with three-body effective interactions for p-shell nuclei -: art. no. 152502

We present a qualitative improvement of the ab initio no-core shell model (NCSM) approach by implementing three-body interaction capability for p-shell nuclei. We report the first calculations using three-body effective interactions derived from realistic nucleon-nucleon potentials for Li-6 , Be-8 , and B-10 and demonstrate that the use of three-body effective interactions speeds up the convergence of the NCSM approach. For B-10 , we predict J(pi)T = 1(+)0 ground state, contrary to the experimental observation of 3(+)0 , when the AV8' potential is used, indicating the need for true three-body forces.