I need the derivation of Bethe formula for stopping power, but I can't see the corresponding paper to this matter.
Application of Ordinary Space-Time Concepts in Collision Problems and Relation of Classical Theory to Born's Approximation. E. J. Williams. Rev. Mod. Phys. 17 no. 2-3 (1945) pp. 217-226.
Can anyone help me about this paper please?