An electron is fired into the reactor core containing the radioactive material, usually uranium, and as it hits the radioactive nucleus the uranium atom breaks down forming two daughter nuclei and emitting another electron (beta radiation particle) which continues as a chain reaction.
The bullet that starts a fission reaction is a neutron. When a neutron collides with the nucleus of a fissile isotope, such as uranium-235, it can induce the nucleus to undergo fission, releasing more neutrons and a large amount of energy.
To sustain a fission chain reaction, each fission reaction must result in one more fission reaction. And that one should result in one more, and so on.
A stable nuclear fission reaction will be sustained if every fission produces one additional fission reaction.
It used 2 pieces of 93.5% enriched Uranium-235: the target and the bullet at opposite ends of a cannon barrel. Cordite propelled the bullet down the barrel to the target. Once at the target, creating a supercritical mass, the bullet crushed the neutron source which generated a pulse of neutrons (about 10 in the time to set off the bomb).For more details see The Making of the Atomic Bomb by Richard Rhodes.
The first time a fission chain reaction was produced was in 1942
In a chain reaction, each fission reaction must produce at least one additional fission reaction to sustain the reaction. This is necessary to achieve a self-sustaining nuclear reaction where each fission event leads to more fission events, releasing energy in the process. Without this multiplication of fission reactions, the chain reaction would not be able to continue and sustain itself.
fission..sup
For a chain reaction to occur, each fission must produce at least one more fission reaction. This leads to a self-sustaining reaction where each fission event triggers more fission events, resulting in a continuous release of energy.
another name for nuclear fission is: E=MC squared
In a nuclear fission reaction, the energy comes from the splitting of atomic nuclei.
Atomic fission bomb.
In actuality, a spontaneous fission event begins a nuclear chain reaction. It kick starts a nuclear chain reaction. And a neutron from that fission will initiate another fission to continue and rev up that nuclear chain reaction.