Channeled and random proton stopping power in the 30-1000 keV energy range

The stopping power of 30- to 1000-keV protons transmitted through silicon in random and channeling ($〈111〉$, $〈110〉$, and $〈112〉$) directions has been determined. It was found that the stopping power for random and all channeling directions reaches a maximum at about 50 keV. At nearly the same energy the ratio of the channeled-to-random stopping has the maximum value. Present results are compared to the current theories and some previous experimental data.