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This proceeding presents the CONRAD high-purity germanium spectrometer with a large diode (2.2 kg mass) employing electrical cryocooling. The detector is an ideal tool to characterize background up to high energies of ∼ 12 MeV. The detector itself exhibits a high level of radiopurity. Due to the cryocooling the detector is flexible and of low maintenance effort. It can be deployed for example at nuclear reactors for site characterization such as for the CONUS experiment, which is looking for coherent elastic neutrino nucleus scattering. • Radiopure Germanium spectrometer with large detection efficiency at high energies. • Low maintenance and high flexibility due to electrical cryocooling. • Site characterization of gamma and neutron background at a nuclear power plant. • Tungsten as a potential alternative for lead as high-density shield material. [ABSTRACT FROM AUTHOR]

This proceeding presents the decomposition of the background spectra of the four screening detectors GeMPI 1 - 4 at the Gran Sasso Underground Laboratory (LNGS) using Monte Carlo simulations in the Geant4-based framework MaGe. A detailed understanding of the composition of the background spectra was achieved, allowing for the proposal of two new shield designs for future GeMPI-like detectors and enabling a reduction of the integrated background count rate to 15 counts/d/kg in the interval [40, 2700] keV. • GeMPI detectors are the most sensitive Germanium spectrometers in the world. • Background spectrum of the GeMPI detectors has been fully decomposed and understood through Monte Carlo simulations. • Pb210 in the lead shield of the detectors is the most prominent source of background. • Two new shield designs are proposed to reduce the background level and increase the sensitivity of the GeMPI detectors. [ABSTRACT FROM AUTHOR]

On March 6, 2016 at 21:36:51 UT, extended areas of Upper Austria, Bavaria (Germany) and the southwestern part of the Czech Republic were illuminated by a very bright bolide. This bolide was recorded by instruments in the Czech part of the European Fireball Network and it enabled complex and precise description of this event including prediction of the impact area. So far six meteorites totaling 1473 g have been found in the predicted area. The first pieces were recovered on March 12, 2016 on a field close to the village of Stubenberg (Bavaria). Stubenberg is a weakly shocked (S3) fragmental breccia consisting of abundant highly recrystallized rock fragments embedded in a clastic matrix. The texture, the large grain size of plagioclase, and the homogeneous compositions of olivine (Fa31.4) and pyroxene (Fs25.4) clearly indicate that Stubenberg is an LL6 chondrite breccia. This is consistent with the data on O, Ti, and Cr isotopes. Stubenberg does not contain solar wind-implanted noble gases. Data on the bulk chemistry, IR spectroscopy, cosmogenic nuclides, and organic components also indicate similarities to other metamorphosed LL chondrites. Noble gas studies reveal that the meteorite has a cosmic ray exposure ( CRE) age of 36 ± 3 Ma and that most of the cosmogenic gases were produced in a meteoroid with a radius of at least 35 cm. This is larger than the size of the meteoroid which entered the Earth's atmosphere, which is constrained to <20 cm from short-lived radionuclide data. In combination, this might suggest a complex exposure history for Stubenberg. [ABSTRACT FROM AUTHOR]