Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 16: Neutrinoloser Doppelbeta-Zerfall I

T 16.3: Talk

Monday, February 29, 2016, 11:35–11:50, VMP9 SR 07

Results of a search for neutrinoless double-beta decay using the COBRA demonstrator — •Thomas Quante, Claus Gößling, and Kevin Kröninger — TU Dortmund, Exp. Physik IV, Dortmund

COBRA is an experiment aiming to search for neutrinoless double-beta-decay (0νββ-decay) using CdZnTe semiconductor detectors. The main focus is on ¹¹⁶Cd, with a Q-value of 2813.5 keV well above the highest dominant naturally occurring gamma lines. By measuring the half-life of the 0νββ-decay, it is possible to clarify the nature of the neutrino as either Dirac or Majorana particle and furthermore to determine its effective Majorana mass.

The COBRA collaboration operates a demonstrator to search for these decays at the Laboratori Nazionali del Gran Sasso in Italy. The exposure of 234.7 kg d considered in this analysis was collected between September 2011 and February 2015. The analysis focuses on the decay of the nuclides ¹¹⁴Cd, ¹²⁸Te, ⁷⁰Zn, ¹³⁰Te and ¹¹⁶Cd. A Bayesian analysis is performed to estimate the signal strength of 0νββ-decay.