The competing SFR design banks on a novel fission concept: bombarding uranium atoms with neutrons of much higher energy than those used in a traditional nuclear plant.
Every time an incoming neutron bombards one of the uraniumatoms, the atom splits in two, expelling energy and releasing more neutrons, which in turn collide with other atoms and establish a chain reaction.
When bombardinguranium with neutrons, Hahn had made some surprising observations that went against everything known at the time about the dense cores of atoms — their nuclei.