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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Poster

HK 72.53: Poster

Donnerstag, 14. März 2024, 17:15–18:45, HBR 14: Foyer

Theoretical investigation of light transmittance in PWO crystals under radiation damage — •Ather Ahmad¹, Pavel Orsich¹, Hans-Georg Zaunick¹, Kai-Thomas Brinkmann¹, and Simone Sanna² for the PANDA collaboration — ¹II. Physikalisches Institut, Gießen, Germany — ²Institut für Theoretische Physik, Gießen, Germany

Fast response, high density and radiation hardness make lead tungstate (PbWO₄ or PWO) a well suited scintillator for calorimetry of electromagnetic radiation. Lead tungstate crystals are already used as working material in various experiments, e.g. CMS at LHC in CERN. Next-generation crystals (PWO-II) with improved properties were developed for the PANDA experiment at FAIR in Darmstadt. To reduce absorption of the scintillation light within the crystals, the lead tungstate is doped with Lanthanum and Yttrium. This results in a change of the electronic and optical properties. In order to assess the functionality of the calorimeter, we first need to analyse these electronic and optical properties of lead tungstate

Experimental measurements of light transmittance in PWO-II after irradiation with a Co-60 source were done in our working group. In this work we do theoretical calculations in the framework of density functional theory (DFT) to calculate the light transmittance in PWO-II with different defects implemented. These results can be compared to the experiment to obtain a better understanding of radiation induced damage.

This project is supported by HFHF and HGS-hire

Keywords: PWO; PANDA; Transmittance; DFT; FAIR