ABSTRACT
CONTENTS 3.1 Positron and Positronium: General Remarks . . . . . . . . . . . . . . . . . 69
3.1.1 History and General Concepts . . . . . . . . . . . . . . . . . . . . . . . 69 3.1.2 Properties of Symmetry . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 3.1.3 Positronium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
3.2 Interaction of Positrons with Matter . . . . . . . . . . . . . . . . . . . . . . . . 74 3.2.1 Energy Loss and Thermalization . . . . . . . . . . . . . . . . . . . . . 74 3.2.2 Range and Implantation Profile . . . . . . . . . . . . . . . . . . . . . . 76 3.2.3 Diffusion and Mobility . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 3.2.4 Annihilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
3.3 Fundamentals of the Experimental Techniques . . . . . . . . . . . . . . . . 83 3.3.1 Positron Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 3.3.2 Momentum Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
In this chapter, the different processes involving the interaction of the positron with matter and the way that information about the annihilation site can be transported by the emitted radiation are briefly described. The experimental setups used to extract this information will also be discussed.
