Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 52: Neutrino physics without accelerators V

T 52.8: Vortrag

Mittwoch, 1. April 2020, 18:15–18:30, H-HS XIII

Search for double beta decay to excited states with COBRA XDEM — •Yingjie Chu for the COBRA collaboration — TU Dresden, Institut für Kern- und Teilchenphysik, Germany

The COBRA experiment uses CdZnTe semiconductor detectors to search for the neutrinoless double beta decay with the "source=detector" method. Several isotopes of Cadmium, Zinc, and Tellurium, which are known candidates for different double beta decay modes, are contained in the detector material. A new experimental phase has started by upgrading the experiment to the COBRA extended demonstrator (XDEM). The novel detector configuration technology is benefcial for the determination of multiple energy depositions within the same detector and the coincidences analysis between different detectors. This is a key concept to search for the phase space suppressed excited state transitions of double beta decay, which are accompanied by the emission of characteristic gamma lines. This talk will give an overview of the COBRA XDEM detector approach as well as first insights on how to identify the expected signal in the detector array based on Monte-Carlo simulations.