Abstract

The CRESST-III experiment aims at the direct detection of dark matter particles via their elastic scattering off nuclei in a scintillating CaWO_44 target crystal. For many years CaWO_44 crystals have successfully been produced in-house at Technische Universität München with a focus on high radiopurity. To further improve the CaWO_44 crystals, an extensive chemical purification of the raw materials has been performed and the crystal TUM93 was produced from this powder. We present results from an \alphaα-decay rate analysis performed on 344 days of data collected in the ongoing CRESST-III data-taking campaign. The \alphaα-decay rate could significantly be reduced.

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