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Nuclear event in a chain reaction could be said to be similar, but not identical. We need to look a bit more closely at a fission event to understand why.

In a fission event in a chain reaction, a neutron is absorbed by a fissile nucleus, and the resulting instability causes that nucleus to fission, or split. When the nucleus splits, it splits into two approximately parts (called fission fragments), but not the same two parts will appear in every fission event. And one, two or three neutrons might appear, depending on exactly which two fission fragments appear. The total energies in the events will vary from event to event as well, and this has something to do with the energy the absorbed neutron brings when it is absorbed.

We know fission events are similar, but there are variations that preclude them being identical.

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