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Under his leadership the neutron was discovered by James Chadwick in 1932 and in the same year the first experiment to split the nucleus in a fully controlled manner was performed by students working under his direction , John Cockcroft and Ernest Walton .
 James Chadwick, John Cockcroft, Ernest Walton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 James Chadwick, John Cockcroft, Ernest Walton