James Chadwick
Published on Nov 21, 2015
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JAMES CHADWICK
- James Chadwick graduated from the Honours School of Physics in 1911 and spent the next two years under Professor Rutherford
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- James Chadwick used evidence collected by Irene Joliot-Curie, who discovered that when beryllium was bombarded with positively charged alpha particles a beam with a high penetrating power was created.
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- He began working in the Cavendish laboratory. Using polonium as a source of (what he believed were) neutrons, he bombarded wax. Protons were released by the wax and Chadwick made measurements of the protons’ behavior.
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- The protons behaved in exactly the manner they ought to if they had been hit by electrically neutral particles with a mass similar to the proton. James Chadwick also discoverd that this beam was not deflected by either electric or magnetic fields, meaning it contained neutral particles- neutrons. Neutrons were found to have the same mass as protons which accounted for more of the mass of the atom.
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- The common understanding of an atom was now a nucleus containing positively charged protons and neutral neutrons with negatively charged electrons "orbiting" the nucleus.
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- Chadwick at this time did not believe he had discovered a new elementary particle. He believed the neutron to be a complex particle consisting of a proton and an electron.
