at 0<n/2 and at A > n/2, the isotropization period ts ~t0 + t If, however, the distribution function is pronouncedly anisotropic in the initial instant of time, the time of isotropization will be considerably more. These result from the fact that the penetration of particles from the frontal to backward hemisphere is slower at small xo. We shall obtain the velocity of the particle passing to a backward hemisphere is found by integrating Eq. 2.7.14 over x:

This results in the following order of the value:

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