1932 Discovery of Neutrons by
James Chadwick(1891 - 1974)
|In 1932, James Chadwick bombarded beryllium (Be) with alpha aprticles. He allowed the radiation emitted by beryllium to incident on a paraffin wax. It was found that protons were shot out form the paraffin wax. People began to look for what was in the "beryllium radiations".|
Some people suggested that the radiations may be gamma radiation. However, Chadwick found that the radiation could not be gamma radiation since energy and momentum were not conserved in its production. He showed that all the observations could be explained if the radiation consisted of neutral particles of mass approximately equal to that of proton. This neutral particle was named neutron.
equation of the nuclear reaction
This discovery of neutron marked the beginning of current theories of nuclear structure. Immediately, the neutron-proton model ( the Rutherford-Bohr model) of the nucleus was adopted:
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