The design of nuclear weapons aims to create a supercritical mass of fissile material in an instant, triggering a devastating chain reaction. Thermonuclear weapons, using both fission and fusion ...

By the end of the year the physicist Werner Heisenberg had calculated that nuclear fission chain reactions might be possible. When slowed down and controlled in a "uranium machine" (nuclear ...

A US nuclear reactor has switched from Regular to Premium fuel with Southern Nuclear inserting four Lead Test Assemblies ...

It’s rarely appreciated just how much more complicated nuclear fusion is than nuclear fission. Whereas the ... challenge is to keep the nuclear chain reaction within safe bounds, nuclear fusion ...

The word “nuclear” conjures two images ... of radioactive waste for us to store for thousands of years. Fission is a chain reaction that can spiral out of control; but fusion reactors don ...

Yet despite improvements in the design of nuclear-fission reactors ... but requires a chain reaction for the reactor to remain self-sustaining. By comparison, a fusion reactor generates an ...

Try these interactive flashcards based on GCSE physics past papers. By working your way through the flashcards created by experts, you can prepare for your physics exams and make your revision ...

U.S.-German startup Focused Energy, which aims to build power plants fueled by fusion, said on Monday it has signed an ...