The major hurdles China faced when making its first atomic bomb included the weapon design, neutron sources, the detonation wave focusing system, “cold” (or subcritical) tests, and uranium metal ...

It's unfortunate but inevitable, I suppose, that it's been popularly – or unpopularly – called the neutron bomb. It is a tactical field weapon of limited range but very high-density radiation ...

How close were the Nazis to developing an atomic bomb ... German nuclear weapons effort had it) because of a mistake the physicist Walther Bothe made when he measured the neutron absorption ...