Abstract
Abstract
Rare event search experiments using germanium detectors are
operated in underground laboratories to minimize the background
induced by cosmic rays. However, the cosmogenic activation in
germanium crystals on the ground during fabrication and
transportation generates long half-life radionuclides and
contributes a considerable background. We simulated the production
rates of cosmogenic radionuclides in germanium and calculated the
specific activities of cosmogenic radionuclides according to the
scheduled fabrication and transportation processes of 76Ge
enriched germanium detectors. The impact of cosmogenic background in
germanium crystals for the next generation CDEX experiment was
assessed with the scheduled exposure history above ground.