Neutrons; but the cross section area is not so important.
The answer is neutron. :)
Neutrons
Neutrons
The nuclear fission of uranium is a reaction with neutrons.
By neutrons; bu the cross specific area is very small for thermal neutrons.
a free neutron can trigger the split of a particle like uranium 238. It will produce a smaller atom (eg. proctantium), a beta particle and energy.
uranium
Yes, by nuclear fission.
They split the uranium atom.
Uranium
Nuclear fission
Probably you think at fission products.