Advanced Study Course

Section C

Experiment 2.8a – Measurement of the Lifetime of Positronium in Matter

Aim of the experiment:

a) experimental method: time measurements in the ns regime

b) physics: positrons in matter

Preparation: fundamentals of gamma-ray spectroscopy with scintillators, function principle of a photomultiplier tube, signal shape at anode and cathode of the photomultiplier tube, function principle of a constant fraction discriminator, generation and decay of positronium.