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T: Fachverband Teilchenphysik
T 52: Neutrino physics without accelerators V
T 52.7: Vortrag
Mittwoch, 1. April 2020, 18:00–18:15, H-HS XIII
Status and Prospects of the COBRA Experiment — •Juliane Volkmer for the COBRA collaboration — TU Dresden, Institut für Kern- und Teilchenphysik, Germany
As many Beyond-Standard-Model theories predict the existence of the neutrinoless double beta decay (0νββ), this lepton-flavor-violating nuclear reaction is one of today’s most examined processes in fundamental physics. Its observation could help to solve important questions as for the neutrino’s mass or whether it is a Majorana particle, and thus shed light on physics beyond the Standard Model.
In 2011 the COBRA demonstrator was built with the objective of investigating the practicability of using CdZnTe semiconductor crystals for the decay’s investigation. The CdZnTe crystals contain nine isotopes capable of different 0νββ decay modes, can be operated at room temperature and are commercially available. Additionally, the versatile detector material offers the possibility of investigating physics besides the 0νββ decay, like a potential quenching of gA in nuclear processes – by measuring the spectrum shape of the strongly forbidden 113Cd β decay – and exotic β+β+ decay modes.
Last year the demonstrator setup of 4× 4× 4 1 cm3 CdZnTe crystals was upgraded based on the knowledge gained from the many years of operation. With nine additional larger detector crystals, higher exposure rates as well as strongly reduced background levels can be achieved.
This talk shall give an overview of the status, plans and most recent experimental results of the COBRA collaboration.