Ab Initio Nuclear Structure from Helium to Oxygen Final Report: 00-ERD-028

Final report for a research program in theoretical nuclear physics to develop methods and computer programs to perform ab initio calculations for light nuclei ranging from Helium to Oxygen. The method employed is based effective interaction theory within the framework of the shell model. The principal accomplishments were: (1) participation in the validation of ab initio for 4He; the first study of A = 6 nuclei with the realistic, non-local CD-Bonn potential; (2) a study of ''intruder'' states in 8Be, (3) the first shell-model calculations implementing three-body clusters in the effective interaction for nuclei with A > 4; (4) the discovery that two-nucleon interactions by themselves are inadequate to describe the structure of the nucleus 10B, which provides proof that three-nucleon forces affect nuclear structure; (5) first calculations including the Tucson-Melbourne three-nucleon force, which gives better agreement with the experimental spectrum for 10B and (6) the development of a new shell-model code designed for public release