Abstract
Collisionless Landau damping of sound modes in hot nuclear matter is considered within the framework of the Landau-Vlasov theory. It is shown that the presence of a temperature tail in the equilibrium distribution function at T ≠ 0 leads to a real collisionless damping of sound modes corresponding to F 0 > 0 ( F 0 is the Landau parameter of the interaction amplitude). This attenuation in the sound propagation is absent in cold Fermi liquids where the Landau damping regime appears at F 0 < 0 only, when collective modes cannot propagate. We show that the increase of such collisionless damping is proportional to the temperature for heated nuclei and can be comparable in order of magnitude with the usual collisional attenuation. A possible contribution to the transition from zero- to first-sound propagation in excited nuclear matter is finally discussed.
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