In 1930 Walter Bothe conducted an eperiment in which he bombarded a beryllium with alpha particles. What he observed
was a strong type of radiation, this radiation was not bound to the magnetic field and could even pass through lead, and then force
protons out of a piece of paraffin slug. Both was convined that he had discovered a new type of radiation, when in fact
he had discovered neutrons.
It wasnt until James Chadwick went over Bothes experiment in 1932 that the neutron would offically be discovered.
Due to the fact that Chadwick saw the neutrons he would be given credit for discovering them not Bothe.