This is a nuclear fission reaction as shown here.
What is a nuclear fission reaction?
Nuclear fission is a type of nuclear reaction in which the nucleus of an atom splits into two or more smaller nuclei, along with the release of a significant amount of energy.
Here we can see that a neutron causes the disintegration of the uranium nuclide to produce the krypton and barium nuclide alongside more neutrons.
Nuclear fission is the process harnessed in nuclear power plants for electricity generation and is also a key component in the functioning of nuclear weapons.