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The GeMSE facility for low-background γ-ray spectrometry

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BORIS DOI
10.7892/boris.99746
Date of Publication
2016
Publication Type
Article
Division/Institute

Physikalisches Instit...

Institut für Geologie...

Albert Einstein Cente...

Author
von Sivers, Moritz
Physikalisches Institut, Laboratorium für Hochenergiephysik (LHEP)
Hofmann, Beda Anton
Institut für Geologie
Rosén, Åke Viktor
Institut für Geologie
Schumann, Marcorcid-logo
Albert Einstein Center for Fundamental Physics (AEC)
Subject(s)

500 - Science::530 - ...

500 - Science::550 - ...

Series
Journal of instrumentation
ISSN or ISBN (if monograph)
1748-0221
Publisher
Institute of Physics Publishing IOP
Language
English
Publisher DOI
10.1088/1748-0221/11/12/P12017
Description
We describe a new high-purity germanium (HPGe) detector setup for low-background γ-ray spectrometry. The GeMSE facility (Germanium Material and meteorite Screening Experi- ment) is dedicated to material screening for rare event searches in astroparticle physics as well as to the characterization of meteorites. It is installed in a medium depth (~620 m.w.e.) underground laboratory in Switzerland in a multi-layer shielding and is equipped with an active muon veto. We have reached a very competitive integral background rate of (246 ± 2) counts/day (100–2700 keV) and measured a sensitivity of ~0.5–0.6 mBq/kg for long-lived isotopes from the 238U/232Th chains in a ~1 kg sample screened for ~27 days. An extrapolation to higher sample masses and mea- surement times suggests a maximum sensitivity in the O(50) μBq/kg range. We describe the data analysis based on Bayesian statistics, background simulations, the efficiency calibration and first sample measurements.
Handle
https://boris-portal.unibe.ch/handle/20.500.12422/152664
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Sivers_2016_J._Inst._11_P12017 Kopie.pdftextAdobe PDF1.1 MBpublisherpublished restricted
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