Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 56: Neutrinophysik 4 (Doppelbetazerfall und Massen)

T 56.1: Group Report

Tuesday, March 28, 2017, 16:45–17:05, VSH 118

Status and Perspectives of the COBRA Experiment — •Jan Tebrügge for the COBRA collaboration — Experimentelle Physik IV, TU Dortmund

The COBRA collaboration searches for neutrinoless double beta-decay. The detection of this decay would be a proof of lepton number violation and could answer several questions in neutrino physics. The collaboration operates a demonstrator setup at the Gran Sasso underground laboratory consisting of about 400g of CdZnTe detectors. This detector material is a commercially available room-temperature semiconductor. It contains nine double beta-decay isotopes, of which Cd-116 is the most promising one due to its high Q-value of 2813 keV. This talk gives an overview of the demonstrator and discusses the measurement of the fourfold-forbidden non-unique beta-decay of Cd-113. Its measurement allows the precise determination of the quenching of the g_A factor of this weak process. This dedicated investigation is being done at the moment. Furthermore, recent developments for the installation of the extended demonstrator (XDEM) are shown. XDEM will use larger detectors which have six times the volume of the current detectors. A new powerful tool for background reduction will be discussed which improves the veto capabilities of surface events by up to two orders of magnitude.