Abstract
The kinetic equation for a Lorentzian gas of particles with spin is investigated for a high external magnetic field. By time averaging over many precession periods the original kinetic equation decomposes into a set of separate equations. Each of them connects only elements of the distribution matrix with the same difference of magnetic quantum numbers. In particular, for the diagonal elements an equation of the Wang Chang-Uhlenbeck-de Boer type is obtained. The pertaining cross sections depend also on the field direction h . The eigenvalues of the dynamical operator are shown to have a positive real part. As an application, the h-dependent cross sections for spin-1/2-particles and the heat conduction in the high field limit are treated.
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