What model of the atomic nucleus was proposed by D.D. Ivanenko and V. Heisenberg?

Soon after the discovery of the neutron in 1932, the Russian physicist Dmitry Dmitrievich Ivanenko (1904-1994) and the German physicist Werner Heisenberg (1901-1976) independently proposed a proton-neutron model of the atomic nucleus. According to this model, the nucleus of an atom of any chemical element consists of protopes and neutrons.

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