Whose discovery was the neutron?

In 1932 James Chadwick, working at the Cavendish Laboratory, discovered the neutron, a particle with no electric charge found in the nucleus of atoms. He interpreted puzzling radiation from beryllium as being caused by neutral particles with a mass similar to the proton. The discovery completed the basic picture of the atom as a nucleus of protons and neutrons surrounded by electrons. Neutrons proved crucial for nuclear physics, because they can enter nuclei easily and trigger reactions such as nuclear fission. Chadwick was awarded the Nobel Prize in Physics in 1935.