Shell-Model Calculation of the Even-Parity States ofNe20

The nuclear shell model has been applied to calculate the positive-parity energy levels of ${\mathrm{Ne}}^{20}$. The problem of four interacting particles in the $2s-1d$ shell has been solved for low-lying states using a technique which is particularly suited to automatic computation. The resulting energy levels are in quite good agreement with the experimental results for a reasonable internucleon potential.