More than seven decades after German chemists discovered nuclear fission — the splitting of an atom that is harnessed by nuclear energy and nuclear weapons — scientists still can’t describe the process in detail. A paper to appear in Physical Review Letters underscores that knowledge gap with the report of a totally unexpected type of fission in the element mercury. Instead of splitting into two equal-mass chunks as theory predicts, this bit of mercury split into uneven chunks, one lighter and one heavier than expected.
Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.