Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster I

HL 13.17: Poster

Monday, March 18, 2024, 15:00–18:00, Poster E

Theoretical characterization of lead tungstate (PWO-II) crystal structure for improved electromagnetic calorimetry — •Ather Ahmad¹, Kai-Thomas Brinkmann¹, and Simone Sanna² — 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 an electromagnetic calorimeter. Lead tungstate crystals are already used as working material in various experiments, e.g. CMS at LHC in CERN. New generation crystals (PWO-II) with improved properties were developed for the PANDA experiment at FAIR in Darmstadt.

In order to assess the functionality of the calorimeter, we first need to analyse the electronic and optical properties of lead tungstate. To achieve this the determination of the crystal structure of PWO-II is essential. In our work, we calculate Raman spectra for various phases of PWO crystals in the framework of density functional theory (DFT). Subsequently, these calculated spectra can be compared with experimental Raman spectra of our PWO-II crystals, facilitating the identification of its phase.

This project is supported by HFHF and HGS-hire

Keywords: PWO; PANDA; Raman; DFT; FAIR