2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18613The new interatomic potential g(r), providing the tunnelling of atoms, is suggested for calculating HFB phonon-roton spectrum E(p) of liquid He-4. The tunnelling enables the calculations to reproduce the experimental dependence of shifts E(p) on pressure P induced by He-3 admixture in the constant total density and volume.5 pages, 2 eps figures, added referencesStatistical Mechanicstext