Aluminum as a source of background in low background experiments
arXiv:1105.3591 · doi:10.1016/j.nima.2011.05.042
Abstract
Neutrinoless double beta decay would be a key to understanding the nature of neutrino masses. The next generation of High Purity Germanium experiments will have to be operated with a background rate of better than 10^-5 counts/(kg y keV) in the region of interest around the Q value of the decay. Therefore, so far irrelevant sources of background have to be considered. The metalization of the surface of germanium detectors is in general done with aluminum. The background from the decays of 22Na, 26Al, 226Ra and 228Th introduced by this metalization is discussed. It is shown that only a special selection of aluminum can keep these background contributions acceptable.
11 pages, 3 Tables, 11 Figures, accepted for publication in NIM A
References in corpus (4)
- \textsc{MaGe} - a {\sc Geant4}-based Monte Carlo Application Framework for Low-background Germanium Experiments
- A New 76Ge Double Beta Decay Experiment at LNGS
- First observation of alpha decay of 190-Pt to the first excited level (E_{exc}=137.2 keV) of 186-Os
- Characterization of the first true coaxial 18-fold segmented n-type prototype detector for the GERDA project