Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 4: Detektorsysteme I

T 4.4: Vortrag

Montag, 9. März 2015, 14:50–15:05, L.09.28 (HS 12)

Upgrade of the Muon Veto and current status of the Dortmund Low Background HPGe Facility — Claus Gößling, Kevin Kröninger, Till Neddermann, •Christian Nitsch, and Thomas Quante — TU Dortmund, Physik EIV, D-44221 Dortmund

The Dortmund Low Background HPGe Facility (DLB) is a germanium facility with heavy shielding located above ground. It's primary task is to provide material screening support for the COBRA experiment which was built to search for neutrinoless double beta decay.

Germanium detectors used for low background gamma spectroscopy are usually operated under either a fairly low overburden (O(1m) water equivalent (mwe)) or high overburden, e.g. in specialised underground laboratories (O(>100mwe)). In between, only a few facilities exist, such as the DLB. The artificial overburden of 10mwe already shields the weak component of cosmic rays. The lead castle with a state-of-the-art neutron shielding as well as the active anti-cosmics veto detector enable low background gamma spectrometry with the advantage of good accessibility on the university campus.

Throughout the last years improvements have been made especially on the cosmics veto and the MC simulation leading to an remarkable low integral background counting rate (40-2700 keV) of about 2.5228(52) counts/kg/min. The talk will summarise the completed tasks and present the current status.