Stretch Scheme, a Shell-Model Description of Deformed Nuclei

A good angular-momentum wave function containing the maximum possible intrinsic angular momenta leads to a microscopic description of the nuclear rotational spectra in terms of spherical shell-model states. The rotational excitation energies arise from the residual two-body force. In the actual model calculations, the only approximation was a partial violation of the exclusion principle. The computed departures from the $I(I+1\mathrm{})\mathrm{}$ law are consistent with experiment. Reasons are given for the preference of positive over negative intrinsic deformations.