Neutron was discovered by (Sir James Chadwick) at the University of Manchester. In 1932 by Chadwick has been tested by shooting alpha particles from the polonium boron thin plates and particles with N2 gas detector packed inside, it was found that there is one neutral particles emitted and therefore the power of "neutron" experiments of Thomson and the gold cathode ray tube steel t use cannot be detected neutron. Because there is no neutron reactions with the electromagnetic polarity used in the experiment.
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