We report quantum Monte Carlo calculations of ground and low-lying excited states for nuclei with using a realistic Hamiltonian containing the Argonne two-nucleon and Urbana IX three-nucleon potentials. A detailed description of the Green's-function Monte Carlo algorithm for systems with state-dependent potentials is given and a number of tests of its convergence and accuracy are performed. We find that the Hamiltonian being used results in ground states of both Li and Li that are stable against breakup into subclusters, but somewhat underbound compared to experiment. We also have results for He, He, and their isobaric analogs. The known excitation spectra of all these nuclei are reproduced reasonably well and we predict a number of excited states in He and He. We also present spin-polarized one-body and several different two-body density distributions. These are the first microscopic calculations that directly produce nuclear shell structure from realistic interactions that fit scattering data.
- Received 5 May 1997
- Published in the issue dated October 1997
© 1997 The American Physical Society