nucleus, in connection with which the name Ivanenko entered physics textbooks, including school textbooks. Later D. Ivanenko and E. Gapon proposed the idea of the shell distribution of protons and neutrons in the nucleus (nuclear shell model). In 1933 on the initiative of D. Ivanenko and I. Kurchatov the first Soviet nuclear conference was called. In 1934 D. Ivanenko and I. Tamm laid the basis of the first non-phenomenological theory of paired electron-neutron nuclear forces. They made the significant assumption that interaction can be undergone by exchange of particles with a rest mass not equal to zero. Based on their model, Nobel laureate Hideki Yukawa developed his meson theory. The realization of Ivanenko's far-reaching plans and hopes was interrupted, however. In 1935 he was arrested in connection with the Kirov affair. Exile to Tomsk followed. D. Ivanenko was a professor at Tomsk University from 1936 to 1938. Until the beginning of World War II, he managed the theoretical-physics personnel at Sverdlovsk University and Kiev University. In 1940 he defended his doctoral dissertation. In this period, Ivanenko's scientific interest gradually shifted from nuclear physics to cosmic ray theory. In particular, he proposed a non-linear generalization of Dirac's equation (1938). Based on this generalization, W. Heisenberg and D. Ivanenko developed the unified nonlinear field theory in the 1950s. From 1943 and until the last days of his life, Professor Ivanenko was closely associated with the physics faculty of M. V. Lomonosov Moscow State University. In 1943, D. Ivanenko and I. Pomeranchuk predicted the phenomenon of synchrotron radiation given off by relativistic electrons in magnetic fields. This radiation was soon discovered by American experimenters. The discovery of synchrotron radiation opened a new and important chapter in modern physics as a result of its special properties and possible applications. Classical and quantum theory of synchrotron radiation was developed in research performed by students and followers of D. D. Ivanenko: A. A. Sokolov, I. M. Ternov et al. For their work in this area D. D. Ivanenko and A. A. Sokolov were awarded the Stalin Prize in 1950. Two of D. D. Ivanenko's and A. A. Sokolov's monographs Classical Field Theory and Quantum Field Theory were published at the beginning of the 1950s, The theme of Professor Ivanenko's postwar work was mesodynamics, theory of hypernucleus, the unified non-linear spinor field theory, gravitation theory. In the 1960s, D. Ivanenko did intensive scientific, scientific-methodological, and organizational work