Ab InitioShell Model Calculations with Three-Body Effective Interactions forp-Shell Nuclei

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 ⁶Li, ⁸Be, and ¹⁰B and demonstrate that the use of three-body effective interactions speeds up the convergence of the NCSM approach. For ¹⁰B, we predict J^πT0ex0ex=0ex0ex1⁺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.