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T: Fachverband Teilchenphysik

T 69: Search for Dark Matter 3

T 69.6: Vortrag

Mittwoch, 6. März 2024, 17:15–17:30, Geb. 30.35: HSI

ELOISE - Electronic stopping power in CaWO₄ and Al₂O₃ for background simulations — •Holger Kluck¹, Jens Burkhart¹, and Michael Stoeger-Pollach² — ¹Institut für Hochenergiephysik der Österreichischen Akademie der Wissenschaften, 1050 Wien, Österreich — ²Technische Universität Wien, University Servicecentre for TEM, 1040 Wien, Österreich

CaWO₄ and Al₂O₃ are well-known target materials for experiments searching for rare events like CEνNS with NUCLEUS or hypothetical dark matter-nucleus scattering with CRESST. Pushing the detection threshold down to sub-keV energies, experiments require verified and reliable simulations of radioactive background components at sub-keV energies, such as those based on the widely used Geant4 toolkit.

The ELOISE project aims to tackle this issue for electromagnetic particle interactions in both materials. Currently, we are preparing an evaluation of Geant4’s current accuracy by conducting benchmark simulations and comparing them with data from extended literature research and dedicated measurements. As sub-keV data on the electronic stopping power is rare or totally missing, ELOISE conducted dedicated measurements for CaWO₄ and Al₂O₃. Currently, we are deducing electronic stopping powers from our measurements.

In this contribution, I will shortly motivate the problem and outline the scope of ELOISE. Afterwards, I will report the results of ELOISE’s reference measurements. Finally, I will discuss our preliminary findings for the electronic stopping power in CaWO₄ and Al₂O₃ at sub-keV energies.

Keywords: Radioactive background; Geant4 simulation; Electronic stopping power; Low energy nuclear recoils