SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Instrumentation IV

HK 13.2: Vortrag

Dienstag, 21. März 2023, 17:15–17:30, SCH/A251

Systematic Studies of Radiation Damage and Stimulated Recovery of PWO — •Pavel Orsich, Valery Dormenev, Hans-Georg Zaunick, Markus W. H. Moritz, Rainer W. Novotny, and Kai-Thomas Brinkmann — II. Physikalisches Institut, Justus-Liebig-Universität, Gießen

Degradation of the optical transmittance of lead tungstate (PWO) scintillation crystals in the luminescence spectrum under ionizing radiation leads to loss of the light output, which results in the deterioration of the energy resolution. Stimulated recovery allows to restore the optical transmittance losses and is achieved by inducing photons of different wavelengths via external light sources (laser diode, LED). Here we report on new results of studies on the stimulated recovery and the radiation damage under gamma irradiation cooled down and at room temperature of lead tungstate crystals. It includes light output and transmittance degradation of PWO, correlations between variations of transmittance at 420 nm and the radiation induced absorption coefficient. Moreover, we present the first lab experiment results of in-situ recovery of the PWO optical transmittance during radiation period³. We also propose the model of the radiation damage and the stimulated recovery of damaged PWO after gamma irradiation as well as spontaneous recovery.
This work is supported by BMBF, GSI and HFHF.