We derive new Hamiltonians for the sd shell, USDA and USDB, based on a renormalized G matrix with linear combinations of two-body matrix elements adjusted to fit a complete set of data for experimental binding energies and excitation energies for the sd-shell nuclei. These Hamiltonians provide a new level of precision for realistic sd-shell wave functions for applications to nuclear structure and nuclear astrophysics.

Low-lying states of nuclei provide an ideal laboratory in which to study quantum many-body effects. They also provide unique information on the fundamental nature of the strong and weak interactions, provided that the

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