Experiments

• AG - astrophysics and geophysics
• BK - biophysics and complex systems
• FM - solid state physics and physics of materials
• KT - nuclear physics and particle physics

KT - nuclear physics and particle physics

• KT.DAK - Data Analysis of e+ e- Collisions at Belle
• KT.GID - Gas-filled Ionization Detectors
• KT.HIP - Higgs Physics with the ATLAS Experiment
• KT.HPD - Semiconductor Pixel Detectors
• KT.KRB - Nuclear Reaction Analysis at the Accelerator
• KT.MOE - Mössbauer Spectroscopy
• KT.PIR - Elemental analysis by proton induced X-ray emission (PIXE)
• KT.POV - Positron Annihilation: Coincidence Spectroscopy
• KT.PTQ - Studies on the Physics of the Top Quark
• KT.WZE - W/Z Experiment at the Tevatron

KT.POV - Positron Annihilation: Coincidence Spectroscopy

We demonstrate the positron life time spectroscopy using positrons from the decay of Na-22 into Ne-22. We measure the life time of positrons in metal samples and insulators with a time resolution of a few hundred picoseconds. The life time is an indicator for the existence of vacancies and voids in a material and also an indicator for the formation of positronium (e⁺-e^-). We use different types of gamma detectors to detect gammas from the Na-22 decay and gammas from positron annihilation. We set up a time coincidence measurement using conventional nuclear spectroscopy modules and perform the time calibration and time resolution measurements. We also evaluate the angular correlation of the annihilation radiation using a coincidence setup.