doctoral thesis

10 CHAPTER 1. INTRODUCTION
− dE
dx
⏐
⏐ col
= ρ NA
A
Emax
Emin
′ dσ
E
dE ′
⏐
⏐ col
dE ′ = ρ NA
A kcol . (1.3)
In literature one often finds the thickness dx measured in g/cm2 and the energy loss
− dE
⏐ given in MeV cm col 2 /g. We will note − 1
⏐
dE ⏐ instead, which leaves dx with
col
dx
ρ dx
the unit length. Let kcol(ν) the energy loss resulting from close collisions, then the total energy loss is
given by the sum of the two
Distant Collisions
− 1 dE
⏐
ρ dx
⏐ col
= NA
A
kcol(ν) . (1.4)
For the calculation of the energy loss due to distant collisions kcol(