Aluminum as a source of background in low background experiments

Details Aluminum as a source of background in low background experiments Aluminum as a source of background in low background experiments

2011-05-18

arxiv.org/abs/1105.3591v1

Physics

Instrumentation and Detectors

11 pages, 3 Tables, 11 Figures, accepted for publication in NIM A

Scientific paper

10.1016/j.nima.2011.05.042

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.

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