The quadrupole deformation of ${\mathrm{Li}}^7$ is calculated by generating many-particle wave functions from deformed single-particle orbitals. In order to account for the $E2\mathrm{}$ properties of ${\mathrm{Li}}^7$ and retain the dominance of the basic shell-model configuration, excitation of the ${\mathrm{}\left(1s\right)\mathrm{}}^4$ core must be included. The admixtures of higher configurations are appreciable.

• Received 30 July 1965

DOI:https://doi.org/10.1103/PhysRev.140.B1190