You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was the existence of the neutron confirmed?" whose answer is 1932.
Each document should contain about 30 words, and these documents should contain useful information.

Query: discovery of the neutron confirmation
Useful Output:

Doc 1: In 1932, James Chadwick proved the existence of neutrons in the nucleus, he discovered: A neutron has a mass similar to the proton. A neutron
Doc 2: The story begins in 1932, with the discovery of the neutron by Sir James Chadwick, an English physicist.
Doc 3: A consistent theory was impossible until English physicist James Chadwick discovered the neutron in 1932. He found that alpha particles reacted
Doc 4: In this GCSE Physics video, we explain how the alpha scattering experiment revealed that atoms contain a small, positively charged nucleus,
Doc 5: Eighty years ago, British physicist James Chadwick the existence of neutrons, which together with protons make up the atomic nucleus.