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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Astroparticle Physics

HK 25.2: Vortrag

Donnerstag, 2. September 2021, 17:00–17:15, H4

Pulse shape discrimination for the CONUS experiment — •Jakob Henrichs for the CONUS collaboration — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

The CONUS experiment, using four 1 kg-sized point-contact high-purity germanium detectors (HPGe) aims at the detection of coherent elastic neutrino nucleus scattering (CEνNS) in the fully coherent regime. It is located close to the reactor core of the nuclear power plant in Brokdorf, Germany. For the success of the experiment a very good background suppression is crucial. Therefore, a sophisticated shield as well as a muon anticoincidence veto system were installed, to reduce efficiently the overall background.
Further, the analysis of the pulse shape of each event offers a new opportunity for an additional background reduction. Depending on whether the incoming particle interacts in the fully depleted bulk region or in the transition layer of the detector, the resulting pulse shapes are different. The transition layer is an outer layer of the Ge diode, where the charge collection efficiency is below 100%. In this talk a technique to discriminate the different low energy interactions based on a rise time fit of their pulses will be presented. In addition, it will be demonstrated how this technique can also be applied to distinguish between multi-site and single-site events at higher energies.