<P> In 1931 , Walther Bothe and Herbert Becker found that if alpha particle radiation from polonium fell on beryllium , boron , or lithium , an unusually penetrating radiation was produced . The radiation was not influenced by an electric field , so Bothe and Becker assumed it was gamma radiation . The following year Irène Joliot - Curie and Frédéric Joliot in Paris showed that if this `` gamma '' radiation fell on paraffin , or any other hydrogen - containing compound , it ejected protons of very high energy . Neither Rutherford nor James Chadwick at the Cavendish Laboratory in Cambridge were convinced by the gamma ray interpretation . Chadwick quickly performed a series of experiments that showed that the new radiation consisted of uncharged particles with about the same mass as the proton . These particles were neutrons . Chadwick won the Nobel Prize in Physics for this discovery in 1935 . </P>
<P> In 1931 , Walther Bothe and Herbert Becker found that if alpha particle radiation from polonium fell on beryllium , boron , or lithium , an unusually penetrating radiation was produced . The radiation was not influenced by an electric field , so Bothe and Becker assumed it was gamma radiation . The following year Irène Joliot - Curie and Frédéric Joliot in Paris showed that if this `` gamma '' radiation fell on paraffin , or any other hydrogen - containing compound , it ejected protons of very high energy . Neither Rutherford nor James Chadwick at the Cavendish Laboratory in Cambridge were convinced by the gamma ray interpretation . Chadwick quickly performed a series of experiments that showed that the new radiation consisted of uncharged particles with about the same mass as the proton . These particles were neutrons . Chadwick won the Nobel Prize in Physics for this discovery in 1935 . </P>
who discovered that the nuclei of atoms contained neutrons that carries no charge
who discovered that the nuclei of atoms contained neutrons that carries no charge
James Chadwick
James Chadwick