Würzburg 2018 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 2: Detector Physics

ST 2.8: Vortrag

Dienstag, 20. März 2018, 18:30–18:45, Phys-HS P

Ionization Quenching of Plastic Scintillators — •Thomas Pöschl, Martin Losekamm, Daniel Greenwald, and Stephan Paul — Technische Universität München

Plastic scintillators have a long tradition as radiation detectors in high-energy and medical physics. For high-ionizing radiation, however, their light output is not linearly dependent on the particle’s energy deposition. To correctly reconstruct the deposited energy, the scintillator’s response including this saturation effect—commonly called ionization quenching—must be known. We measured the response of two commonly used plastic scintillators to protons with energies of 30 MeV to 100 MeV and compared the data to different empirical quenching models. We calculated the evidence for each model and compared them using Bayes’ factor. We also explored the empirical shape of the quenching response with a model-independent Markov-Chain Monte Carlo fit. This research was supported by the DFG cluster of excellence ‘Origin and Structure of the Universe‘ (www.universe-cluster.de).