SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Nuclear Astrophysics IV

HK 40.2: Vortrag

Mittwoch, 22. März 2023, 16:15–16:30, SCH/A419

Low-background radioactivity counting at the most sensitive HPGe detector in Germany — •Steffen Turkat¹, Daniel Bemmerer², Axel Boeltzig², Jonas Koch^1,2, Till Lossin^1,2, Max Osswald^1,2, Konrad Schmidt², and Kai Zuber¹ — ¹Institut für Kern- und Teilchenphysik, TU Dresden, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany

The contribution reports about the commissioning of an ultra low-level γ-ray counting setup in the shallow-underground laboratory Felsenkeller in Dresden, Germany. It includes a high-purity germanium detector of 163 % relative efficiency within passive and active shields. The passive shield consists of 45 m rock overburden (140 meters water equivalent), 40 cm of low-activity concrete, 15 cm of high purity lead, 10 cm of oxygen-free radiopure copper, and an anti-radon box. The active veto is given by five large plastic scintillation panels surrounding the setup. All together, these shieldings attenuate the remaining background rate down to 116(1) kg⁻¹d⁻¹ in an energy interval of [40 keV;2700 keV]. This is the lowest background of any HPGe detector in Germany, among the lowest worldwide, and enables studies of samples well below 1 mBq. In addition to the design of the setup, the underlying analysis techniques will be presented.