Three-body-correlation effect on the ground-state properties ofHe3andHe3↑

We report some Monte Carlo computations of the ground-state properties of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^3{}_{}{}^{}\mathrm{He}$↑, using a variational wave function including explicit three-body correlations. This inclusion results in a slight improvement of the computed properties: internal energy, equilibrium density, and compressibility. The comparison with experiments on ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ remains still largely unsatisfactory.