I will describe recent developments in ab initio no-core shell model (NCSM) [1] calculations for light nuclei including electromagnetic moment and transition investigations in Li, Be and C isotopes. Also, I will discuss our effort to build a new ab initio many-body approach [2] capable of describing simultaneously both bound and scattering states in light nuclei, by combining the resonating-group method [3] with the ab initio no-core shell model. In this way, we complement a microscopic-cluster technique with the use of realistic interactions, and a microscopic and consistent description of the nucleon clusters, while preserving Pauli principle and translational symmetry. I will present results for neutron and proton scattering on light nuclei, including n- and p-4He, and n-7Li. Finally, I will discuss extension of our approach to include deuteron-nucleus channels.

[1] P. Navratil, J. P. Vary, and B. R. Barrett, Phys. Rev. Lett. 84, 5728 (2000).
[2] S. Quaglioni and P. Navratil, Phys. Rev. Lett. 101, 092501 (2008); Phys. Rev. C 79, 044606 (2009).
[3] K. Wildermuth and Y. C. Tang, A unified theory of the nucleus, (Vieweg, Braunschweig, 1977).

Prepared by LLNL under Contract DE-AC52-07NA27344. Support from the U.S. DOE/SC/NP (Work Proposal No. SCW0498), LLNL LDRD Grant No. PLS-09-ERD-020, and from the U. S. Department of Energy Grant DE-FC02-07ER41457 is acknowledged.

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