  The paper devoted to investigation of volume reflection and channeling
processes of ultrarela- tivistic positive charged particles moving in germanium
single crystals. We demonstrate that the choice of atomic potential on the
basis of Hartree-Fock method and correct choice of Debye tem- perature allow us
to describe the above mentioned processes in a good agreement with the recent
experiments. Moreover, the presented in the paper universal form of equations
for volume reflection gives true description of the process at a wide range of
particle energies. Standing on this study we make predictions for mean angle
reflection (as a function of bending radius) of positive and negative particles
for germanium (110) and (111) crystallographic planes.
