Production chain of isotopically modified ge-diodes for the 2β0ν-search with GERDA

The procurement of germanium-oxide (GeO₂) depleted in ⁷⁶Ge is presented. The quality control, the reduction and zone refinement as well as crystal pulling is described as new detection systems must be explored in order to reach the needs of modern rare event searches. The experiment GERDA aims at the detection of neutrinoless double beta (2β0ν) decay. The depleted germanium project aims at the demonstration that working BEGe detectors can be produced based on a realistic material supply chain maximizing the Ge-metal to Ge-diode yield in an optimal usage of the expensive isotopically modified material.