Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 92: Neutrinophysik IV

T 92.3: Vortrag

Donnerstag, 22. März 2018, 17:05–17:20, Z6 - SR 2.012

Selection criteria for 2ν2β-decay measurements with the COBRA experiment — •Julia Küttler for the COBRA collaboration — TU Dresden, Institut für Kern- und Teilchenphysik, Germany

The COBRA collaboration searches for the neutrinoless double beta-decay (0ν2β-decay). This process is forbidden in the Standard Model of particle physics due to the lepton-number violation. Currently a demonstrator setup using coplanar-grid CdZnTe detectors is operated at the underground facility LNGS in Italy. The setup consists of 64 detectors, each with a volume of 1 cm³, arranged in four layers of 4×4 detectors. The CdZnTe semiconductor crystals contain nine double-β isotopes with several possible decay modes. The main focus is on ¹¹⁶Cd due to its high Q-value of 2813 keV. Besides the effort to search for the 0ν2β-decay the 2ν2β-spectrum of the normal double-decay should be measured to confirm half-life measurements of other groups. The most promising 2ν2β-decays are coming from ¹¹⁶Cd and ¹³⁰Te which have not been measured yet by the COBRA experiment itself.

This talk will focus on different selection criteria with the aim to identify run periods and detectors with a high background index. Such a data partitioning will improve the background understanding since one data sample will be background enriched while the other results in a cleaner spectrum. Combining both information will be beneficial for the intended 2ν2β-decay analysis of ¹¹⁶Cd with the COBRA demonstrator.