WASHINGTON — President Trump warned Friday that Iran will not be allowed to enrich uranium — hinting at possible military strikes following the revelation that Tehran has been secretly ...

President Donald Trump reaffirms no uranium enrichment for Iran, countering reports of a secret U.S. proposal allowing limited enrichment, amid ongoing negotiations.

In many fission reactions, researchers send a neutron toward a lighter isotope of uranium, uranium-235.The uranium absorbs the neutron, creating uranium-236. The uranium-236 then splits into two ...

Where U.S. and Iran still stand apart on nuclear talks 02:08. Iran has further increased its stockpile of uranium enriched to near weapons-grade levels, a confidential report by the United Nations ...

The fuel for nuclear fission is usually uranium-235. Image caption, 2. ... This causes the nucleus to become uranium-236, which is violently unstable. Image caption, 4.

A classified International Atomic Energy Agency report found Iran, since February, produced 300 pounds of uranium enriched to 60%, a step away from weapons-grade.

A classified UN report found that Iran has sharply increased its uranium stockpile since February. This comes just as the U.S. prepares for renewed nuclear talks with Tehran.

The uranium-236 then splits into two fragments—the fission products—and the reaction emits some assorted particles. More than 400 nuclear power reactors in operation around the world currently ...