Liquid 4He at zero temperature and the STLS scheme

Within the framework of the self-consistent scheme proposed by Singwi, Tosi, Land and Sjolander (STLS) for an interacting system we study the properties of superfluid liquid He-4. By employing the Aziz potential (HFD-B) as the interaction potential between helium atoms, we have calculated the static structure factor, the pair-correlation function, the elementary excitation spectrum and the effective two-body interaction as a function of wave-vector, for different densities. Our results show considerable improvement over the Ng-Singwi's model potential of a hard core plus an attractive tail and are comparable with experimental data. We have compared our results with experimental data and with the results of some theoretical models. Agreement between our results and the experimental data for the static structure factor for the small k values is fairly good.