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Conference Paper

GIOVE, a shallow laboratory Ge-spectrometer with 100 μBq/kg sensitivity

MPS-Authors

Denz ,  Tobias
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons54359

Hakenmueller,  Janina
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30592

Heusser,  Gerd
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

Hofacker ,  Reinhard
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons31159

Weber,  Marc
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Fulltext (public)

GioveAIP_proc2013.pdf
(Any fulltext), 1001KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Denz, T., Hakenmueller, J., Heusser, G., Hofacker, R., & Weber, M. (2013). GIOVE, a shallow laboratory Ge-spectrometer with 100 μBq/kg sensitivity. American Institute of Physics Conference Proceedings, 1549: 12. doi:10.1063/1.4818065.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-A07D-2
Abstract
A new germanium gamma spectrometer called GIOVE ( G ermanium spectrometer with I nner and O uter V eto) has been set up at the underground/shallow laboratory (15 m w.e.) of MPI-K. Its double plastic scintillator veto system and neutron moderation interlayer lower the background by more than one order of magnitude compared to the other existing spectrometer at this facility. The integral (40-2700 keV) background rate of about 290 counts (day kg)−1 is just a factor 4 to 8 above that of the GeMPI spectrometers operated at LNGS (3800 m w.e.) and thus proves that even under shallow overburden sub mBq/kg sensitivities are achievable. Extended material screening and neutron attenuation studies preceded the final design of the spectrometer. The technical realization of the spectrometer is described in detail with special emphasis on the inner veto system. For its optimisation a simulation model was developed for light collection on small low activity PMT’s under various geometrical conditions. Radon suppression is accomplished by employing a gas tight sample container and a nitrogen flushed glove-box system with an airlock. The active volume of the crystal was modelled by absorption scanning measurements and Monte Carlo simulations. The complete shield is implemented in a Geant4 based simulation framework.