Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 68: Detektorsysteme IV

T 68.1: Talk

Wednesday, March 27, 2019, 16:00–16:15, H08

Current status of the Dortmund Low Background Facility — •Marcel Gerhardt, 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 above ground. With an outer shielding, consisting of barite concrete and cast iron, an artificial overburden of about 10 meters of water equivalent is achieved. This outer shielding houses a multi-layer lead castle, which features borated polyethylene as a neutron moderator and absorber. Additionally, an active muon veto detector is installed in order to reduce cosmic muons contributing to the background spectrum. The DLB’s high-purity germanium detector with a relative efficiency of 60% is set up within this shielding. Therefore, the background-level is remarkably lowered and allows measurements with sensitivities well below the 1 Bq/kg-level, which is comparable to laboratories situated at shallow depths.

In this talk a brief description of the current status of the DLB with the recently completed active muon veto detector, which results into an improved background-level, is given. Also, developments in the digitization of the data acquisition system and ongoing measurements are presented.