LARGE-BASIS SHELL-MODEL STUDIES OF LIGHT-NUCLEI WITH A MULTIVALUED G-MATRIX EFFECTIVE INTERACTION

Large-basis shell model studies of low-lying excitations in light nucl ei from He-4 to Li-7 have been performed with a multivalued G-matrix e ffective interaction, as recently suggested by Haxton et al. Calculati ons were performed relative to the vacuum (''no core'') using very lar ge, separable model spaces containing all excitations with unperturbed energies up to 8HBAR Omega. Using G matrices derived from a new Nijme gen potential, we achieve a very satisfactory description of these exc itations.