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Soutenance de thèse

Vendredi 16 décembre à 14h00
Salle des Séminaires, Bât. A

Oratrice : Ketty Beauvois
"The dynamics of liquid 3He and superfluid 4He investigated by inelastic neutron scattering"


I will present in my talk the results of inelastic neutron scattering measurements performed at the ILL on the helium isotopes 3He and 4He. A highly structured multi-excitation dynamic response is observed in superfluid 4He above the Landau quasi-particles spectrum. In 3He, a Fermi liquid, a complete determination of the spectrum has been achieved, including zero-sound as well as paramagnon excitations. These results allow a better understanding of the dynamics of strongly correlated fermions and bosons. They are compared to theoretical predictions, in particular to the dynamic many-body calculations developed recently.

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