Neutron source BER II, research reactor in Berlin
The Neutron source BER II is a research reactor in Steglitz-Zehlendorf that produced neutrons for scientific experiments from 1974 to 2019. The facility displays a simple, functional design with a sturdy exterior that reflects its purpose as a precision research installation.
The reactor began operations in 1974 and served neutron research in Germany for over 40 years. After this extended period, it was shut down in 2019 to make room for advancing technologies in materials science.
The site is organized with pathways and signage, though access is controlled for safety reasons. Visitors should expect security measures to be in place, as the facility is currently being prepared for decommissioning.
The site was part of a European research network and contributed decades of insights into material properties before higher-output neutron sources like the European facility in Sweden took over its role. The shutdown marks how scientific infrastructure evolves and research centers adapt to new technologies.
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