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Uranium cubes reveal why the German nuclear project failed

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 04/11/2026, 23:58:23 UTC.

Briefings

Historians debate whether Nazi German physicists achieved criticality in the B8 reactor during WWII. A 2013 paper by Timothy Koeth and Miriam Hiebert analyzed 14 known uranium cubes, concluding the project lacked sufficient uranium and heavy water to build a bomb. This research was published in the Proceedings of the National Academy of Sciences Nexus.

Key points

• The B8 reactor was the last German attempt to build a working nuclear reactor during World War II.
• Only 14 uranium cubes are known to exist today, with 10 tracked by Koeth and Hiebert since 2013.

Context

Researchers analyzed 14 uranium cubes from the B8 reactor, concluding the project lacked sufficient uranium and heavy water to build a bomb. This research started in 2013 when Timothy Koeth received a mysterious heavy metal cube from a friend.

Limitations

Only 14 uranium cubes are known to exist today; the specific design of the B8 reactor and the exact criticality conditions are not fully documented in the source.

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