Speaker
Description
The German center for astrophysics (DZA, Deutsches Zentrum für Astrophysik) plans to build, among other projects, a 200m deep underground facility. The facility is called the Low Seismic Lab (LSL) and will be placed in Lusatia, at a precise location still to be determined. Here we report on studies relevant to future nuclear and astroparticle experiments in LSL, in order to estimate the remaining cosmic-ray induced radiation background. The specific natural radioactivity of samples of several $\sim$250m deep drill holes called DZA02, DZA03, DZA05 and DZA07 respectively, has been determined using $\gamma$-ray spectroscopy at the Felsenkeller underground lab (Dresden), with a non-destructive technique including sample geometry modelling. In addition, GEANT4-based simulation studies of cosmic muon propagation have been performed to calculate the muon and neutron flux in LSL.