Nuclear chain reaction animation

Make a video about animation of nuclear chain reaction.
Particle as neutron moves and collide with atomic nucleus, as a result - fission reaction can produce 2 or 3 new neutrons (correct value 2.4 (yes, 2 + 0.4 ) new neutron), which is also start to move and can support new fission acts of others nucleus. At some point and correct nuclear fuel configuration reaction could be stable and growing.
The challenge is make as much as possible neutrons animation, which works with comfortable fps and optimize algorithm.
https://www.youtube.com/watch?v=PVLDT2JwC1g

thank you for your videos.