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T: Fachverband Teilchenphysik

T 7: Neutrino physics without accelerators II

T 7.5: Vortrag

Montag, 30. März 2020, 17:35–17:50, H-HS V

Experimental Comparison of Empirical Ionization-Quenching Models for Plastic Scintillators — •Thomas Pöschl, Martin J. Losekamm, Daniel Greenwald, and Stephan Paul — Technische Universität München

Plastic scintillators have a long tradition as radiation detectors in high-energy physics and are widely used in calorimetry. 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. Several empirical models have been developed in the last decades, each giving a different functional form to the ionization-density dependence of the magnitude of quenching --- the so-called quenching function.

We measured the response of two commonly used plastic scintillators to protons and validated the compliance of several quenching models with our data using a Bayesian approach. We calculated the evidences of the models and compared them using Bayes factors. The required posterior-probability distribution for each model was evaluated using a Markov-Chain Monte-Carlo algorithm. To further examine the functional form of the quenching function, we performed a model-independent fit to the data for both scintillators. We found that none of the investigated empirical models can describe the functional form of the quenching function for both scintillators within the explored range of ionization densities.