For four years, James Chadwick was a prisoner of ... They used a different method for tracking particle radiation. Chadwick repeated their experiments but with the goal of looking for a neutral ...

These included J.J. Thomson's 1897 discovery of the electron and James Chadwick's 1932 identification of the neutron. But perhaps the most famous of these experiments was Hans Geiger and Ernest ...

It wasn't until 1932 that James Chadwick was able to prove its existence. Chadwick used a version of Rutherford's experiment, using a sheet of beryllium and a paraffin block instead of gold foil.