Collisional relaxation of collective motion in a finite Fermi liquid

Details Collisional relaxation of collective motion in a finite Fermi liquid Collisional relaxation of collective motion in a finite Fermi liquid

1999-01-18

arxiv.org/abs/nucl-th/9901048v2

Phys.Rev.C58:198-208,1998

Physics

Nuclear Physics

Nuclear Theory

REVTeX, 36 pages, included 13 PostScript figures

Scientific paper

10.1103/PhysRevC.58.198

Finite size effects in the equilibrium phase space density distribution function are taken into account for alculations of the relaxation of collective motion in finite nuclei. Memory effects in the collision integral and the diffusivity and the quantum oscillations of the equilibrium distribution function in momentum space are considered. It is shown that a smooth diffuse (Fermi-type) equilibrium distribution function leads to a spurious contribution to the relaxation time. The residual quantum oscillations of the equilibrium distribution function eliminates the spurious contribution. It ensures the disappearance of the gain and loss terms in the collision integral in the ground state of the system and strongly reduces the internal collisional width of the isoscalar giant quadrupole resonances.

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