Nuclear magnetism of liquid 3He: new determination of the Landau parameter F0a

He3 is a liquid Fermi model, isotropic, with an attainable Fermi temperature and the interaction between atoms can be controlled by changing the pressure of the liquid. In this document, we present accurate NMR measurements of the nuclear magnetic susceptibility of liquid He3 as a function of temperature and pressure. The emphasis has been placed on reliable thermometry and on He3 pressure measurements directly in the cell to increase the measuring range until solidification, and an accurate characterization of the NMR spectrometer. Our measurements give an effective Fermi temperature 5% lower than former results. The Landau parameter F0a depends on the effective mass, which is determined by specific heat measurements, and consequently on the temperature scale. The re-analysis of the specific heat measurements with the PLTS-2000 temperature scale yields an effective mass increase of 4.5%. In this document, F0a is determined for 2 temperature scales (PLTS-2000 and Greywall). Contrarily to former measurements, the F0a density dependence does not show any saturation at high pressures. (author)