Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 22: Poster

T 22.6: Poster

Montag, 19. März 2018, 16:00–18:30, Z6 - Foyer

Status of the Dortmund Low Background Facility — •Marcel Gerhardt, Claus Gössling, Kevin Kröninger, and Christian Nitsch — TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Otto-Hahn-Straße 4a, 44227 Dortmund

The Dortmund Low Background Facility (DLB) is a low-background gamma-ray spectrometry system built at ground level on the campus of the Technische Universität Dortmund. It uses a high-purity germanium detector with a relative efficiency of 60 %. The detector is set up within a massive artificial overburden, corresponding to ten meters of water equivalent. This overburden consists of barite concrete and cast iron. It houses a multi-layer lead castle that features borated polyethylene as a neutron moderator and absorber. Additionally, an active muon veto is installed to reduce the cosmic-induced muon contributions to the spectrum.

The remarkably low background level of the DLB allows radio-purity screening measurements for material preselection and the detection of radionuclides with short halflifes for activation analysis, with sensitivities well below the Bq/kg-level, which is comparable to laboratories with shallow depths.

An overview of the current status of the DLB with the recently completed muon veto, which results into an approved background level, is given. Also, first developments in the digitization of the data acquisition system are presented.