Small damping approach in Fermi-liquid theory

Details Small damping approach in Fermi-liquid theory Small damping approach in Fermi-liquid theory

2006-01-31

arxiv.org/abs/nucl-th/0601094v1

Cent. Eur. Journ. Phys. V.4 N3 (2006) 393-404

Physics

Nuclear Physics

Nuclear Theory

11 pages, 3 figures

Scientific paper

10.2478/s11534-006-0022-1

The validity of small damping approximation (SDA) for the quasi-classical description of the averaged properties of nuclei at high temperatures is studied within the framework of collisional kinetic theory. The isoscalar collective quadrupole vibrations in hot nuclei are considered. We show that the extension of the SDA, by accounting for the damping of the distribution function $\delta f$ in the collision integral reduces the rate of variation with temperature of the Fermi surface distortion effects. The damping of the $\delta f$ in the collision integral increases significantly the collisional width of the giant quadrupole resonance (GQR) for small enough values of the relaxation time. The temperature dependence of the eigenenergy of the GQR becomes much more weaker than in the corresponding SDA case.

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