Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 68: Neutrino physics without accelerators III
T 68.5: Talk
Wednesday, March 17, 2021, 17:05–17:20, Tr
Pulse Shape Analysis in GERDA — •Vikas Bothe for the GERDA collaboration — MPIK Heidelberg
The GERDA experiment searches for the neutrinoless double- beta decay of 76Ge using enriched high purity Germanium diodes as a source as well as a detector. For such a rare event search, the sensitivity of the experiment can be improved by employing active background suppression techniques. The time-profile analysis of the signals, called pulse shape analysis (PSA), generated by energy deposits within the detectors is employed to discriminate signal and background events. The PSA can highly reject background events like alpha particles and Compton scattered photons while preserving a high signal efficiency for 2νββ-like events.
In Phase II, GERDA operated 44.2 kg HPGe detectors which included 6 semi-coaxial detectors, 5 inverted coaxial detectors, and 30 point-contact BEGe detectors. Different pulse shape analysis techniques were employed for these three types of detectors due to their different geometries. I will discuss the results from the pulse shape analysis of these detectors after the final data unblinding from May 2020.