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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.21: Poster

Montag, 27. März 2023, 13:00–15:00, P2/EG

Excited-state properties of PbWO4 from ab initio calculations — •Ather Ahmad and Kai-Thomas Brinkmann — II. Phys. Inst. Gießen

Fast response, high density and radiation hardness make lead tungstate (PbWO4 or PWO) a well suited scintillator for an electromagnetic calorimeter. Lead tungstate crystals are already used as working material in various experiments, e.g. the CMS at the LHC in CERN. New 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. In our work, we investigate these properties of lead tungstate containing different impurities and defects with ab initio calculations to derive its radiation hardness and scintillation mechanism.

This project is supported by HFHF and HGS-hire