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The inelastic quasiparticle lifetime due to the electron-electron interaction(out-scattering time in the kinetic equation formalism) is calculated forfinite metallic diffusive systems (quantum dots) in the whole range ofparameters. Both cases of ``continuous'' (the inelastic level broadening muchexceeds the mean level spacing) and ``discrete'' spectrum are analyzed. Inparticular, crossover between one- and zero-dimensional regimes is studied indetail. In the case of continuous spectrum the out-scattering time is shown tobe the same as the inelastic time entering expressions for universalconductance fluctuations and persistent currents. It is also found to beshorter than the phase-breaking time in two- and one-dimensional systems, whilein zero-dimensional systems these two times coincide. In the case of discretespectrum for small enough systems a universal behavior of the scattering timeis obtained. For temperatures below the mean level spacing the out-scatteringrate is shown to be vanishingly small.Comment: 24 pages + 4 figures, Revtex. Final version, some revisions are made,  references to recent work adde

Electron-electron scattering rate in disordered mesoscopic systems