Question: who is credited with the discovery of the neutron
[{'answer': 'James Chadwick', 'provenance': [{'wikipedia_id': '46190717', 'title': 'Discovery of the neutron', 'start_paragraph_id': 2, 'start_character': 96, 'end_paragraph_id': 2, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46190717', 'title': 'Discovery of the neutron', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 204, 'bleu_score': 0.9419661180380051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6684702245696768120}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42195952', 'title': 'Trinity: A Graphic History of the First Atomic Bomb', 'section': 'Section::::Plot Summary.\n', 'start_paragraph_id': 5, 'end_paragraph_id': 5, 'meta': {'evidence_span': ['The story presents a brief timeline that continues up into the 1930s, when James Chadwick discovers neutrons and the discovery of nuclear fission. T', 'The story presents a brief timeline that continues up into the 1930s, when James Chadwick discovers neutrons and the discovery of nuclear fission.', 'and upon receiving a "No, sir", recounts the myth. The novel then goes back in time to 1898, when the Marie Curie and her husband discover radioactivity. The story presents a brief timeline that continues up into the 1930s, when James Chadwick discovers neutrons and the discovery of nuclear fission. The novel takes a shift, and begins to discuss the political environment. Leo Szilard becomes troubled as he sees the dangers that these nuclear weapons could produce, and tra']}}]}, {'provenance': [{'wikipedia_id': '46190717', 'title': 'Discovery of the neutron', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['The essential nature of the atomic nucleus was established with the discovery of the neutron by James Chadwick in 1932 and the determination that it was a new elementary particle, distinct from the proton.', 'The essential nature of the atomic nucleus was established with the discovery of the neutron by James Chadwick in 1932 and the determination that it was a new elementary particle, distinct from the proton']}}]}]