Speaker
Description
The COBRA experiment aims to search for neutrinoless double-beta decay using CdZnTe room-temperature semiconductor detectors. It is located at the Gran Sasso underground laboratory and has been operated stably for several years. In 2018, an upgrade of the COBRA demonstrator to the extended demonstrator was performed by adding nine 6 cm3 CdZnTe detectors to the existing array with 64 1 cm3 detectors. The new detectors have an improved sensitivity as well as a reduced background level. Besides the investigation of nine naturally present ββ nuclides in the detector material, the “source = detector” concept of the COBRA experiment allows the study of exotic decay modes with high inherent detection efficiency. The charge non-conserving decay of 113Cd with the event signature of γ-rays at 391.7 keV resulting from the de-excitation of the isomeric state 113mIn is of particular interest. An improved limit for this process can be achieved using the dataset collected from the two setups.
