Possible Existence of a Neutron

Chadwick’s 1932 Possible Existence of a Neutron, published in Nature, is one of the program’s working technical references. Cited in Book IV (Categorical Microcosm), Part 1, Chapter The Proton and the Electron: β-Decay Products, where the program draws on it in the context of “Historically, the proton was identified first (Rutherford, 1919 ), the electron even earlier (Thomson, 1897 ), and the neutron last (Chadwick, 1932 ).”