SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Instrumentation VIII

HK 28.5: Talk

Friday, September 3, 2021, 15:15–15:30, H2

Radiation damage and annealing studies of PbWO₄ scintillation crystals for the PANDA-EMC — •Pavel Orsich¹, Valery Dormenev¹, Markus W. H. Moritz¹, Hans-Georg Zaunick¹, Kai-Thomas Brinkmann¹, and Mikhail Korjik² — ¹II. Physikalisches Institut, Justus-Liebig-Universität, Gießen — ²Institute for Nuclear Problems, Minsk, Belarus

Lead tungstate scintillation crystals − PbWO 4 (PWO-II) − will be used in the Electromagnetic Calorimeter (EMC) of the high energy physics experiment PANDA at the high-luminosity accelerator facility FAIR (Darmstadt). During the operation of the experiment a degradation of the optical transmission of these crystals will occur due to creation of color centers via radiation damage and as a consequence this leads to the deterioration of the energy resolution of the calorimeter. In order to partially reverse this radiation damage the phenomenon of the stimulated recovery in scintillation crystals have been investigated via illumination by visible and infrared light.

A model of the radiation-induced absorption and its recovery in lead tungstate crystals will be presented. The mechanisms of the radiation damage under γ-radiation and the recovery under light will be discussed.

This work is supported by BMBF, GSI and HFHF.