Cosmogenic activation of Germanium and its reduction for low background experiments

Details Cosmogenic activation of Germanium and its reduction for low background experiments Cosmogenic activation of Germanium and its reduction for low background experiments

2005-11-28

arxiv.org/abs/nucl-ex/0511049v1

Nucl.Instrum.Meth.B251:115-120,2006

Physics

Nuclear Physics

Nuclear Experiment

10 pages, 3 tables, 6 figures

Scientific paper

10.1016/j.nimb.2006.05.011

Production of $^{60}$Co and $^{68}$Ge from stable isotopes of Germanium by nuclear active component of cosmic rays is a principal background source for a new generation of $^{76}$Ge double beta decay experiments like GERDA and Majorana. The biggest amount of cosmogenic activity is expected to be produced during transportation of either enriched material or already grown crystal. In this letter properties and feasibility of a movable iron shield are discussed. Activation reduction factor of about 10 is predicted by simulations with SHIELD code for a simple cylindrical configuration. It is sufficient for GERDA Phase II background requirements. Possibility of further increase of reduction factor and physical limitations are considered. Importance of activation reduction during Germanium purification and detector manufacturing is emphasized.

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