Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 93: Neutrino physics without accelerators IV

T 93.5: Vortrag

Donnerstag, 18. März 2021, 17:00–17:15, Tr

Background characterization for the COBRA experiment — •Juliane Volkmer — IKTP, TU Dresden

In 2011 the COBRA demonstrator was built with the objective of investigating the practicability of using CdZnTe semiconductor crystals for the investigation of double beta decays.
The CdZnTe crystals contain nine isotopes capable of different ββ 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 ββ decay, like a potential quenching of g_A in nuclear processes – by measuring the spectrum shape of the strongly forbidden ¹¹³Cd β decay – and exotic β⁺β⁺ decay modes.
One of the main challenges of investigating such extremely rare processes is the detector’s background, potentially occurring at much higher rates than the searched-for signal itself. The background can be reduced by using ultra-pure materials and great care during the experiment’s construction, a shielding system, as well as analysis cuts on the data.
However, a certain fraction of the background still passes through the shielding and survives the analysis cuts. For this remaining background it is important that it is well understood and characterized.
In this talk an overview of the background present for the COBRA demonstrator is given. The focus lies especially on the results of investigating the background with the help of coincidence analyses.