'A Note on the Interaction of the Neutron and the Proton'. Reprinted from Scientific Papers of the Institute of Physical and Chemical Research, Vol. 30, August, 1936, pp. 61-69, No. 650.

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First separate edition. Original printed wrappers. Very Good. Sin-Itiro Tomonaga: Nobel Prize, Physics, 1965 (shared with Julian Schwinger and Richard P. Feynman), 'for their fundamental work in quantum electrodynamics, with deep-ploughing consequences for the physics of elementary particles.' 'Right after the discovery of the neutron by Chadwick in 1932, Heisenberg published his famous work on the nuclear force and nuclear binding phenomena in 1932. This work affected young Yukawa and Tomonaga greatly. These two freshmen, then only 26 years old, challenged the forefront problems of nuclear physics, and attended the spring meeting of the Japan Physico-Mathematical Society, held in Sendai in 1933. . . . At the same meeting Tomonaga presented his work on the deuteron binding energy and the proton-neutron reaction. At that time Tomonaga was a resident physicist in Nishina's laboratory at RIKEN, and was working on a theoretical explanation of the newly obtained experimental data on the interaction between a proton and a neutron, employing various interaction forms. . . . Here, a great interplay emerged. After this meeting Tomonaga wrote a rather long letter to Yukawa, in which he explained his results in more detail. . . . We can thus imagine that this letter must have had a profound influence on Yukawa, who was in the midst of struggling with the problem of the nuclear force in 1933, but had not yet formulated the idea of the Yukawa interaction, in which the range parameter is related to the mass of the mediating particle. Tomonaga's work on the range of the p-n interaction was later mentioned in a footnote of Yukawa's first paper as 'These calculations were made previously, according to the theory of Heisenberg, by Mr. Tomonaga, to whom the writer owes much. . . .' On the other hand, Tomonaga published this work only in 1936 [6=paper offered here], 3 years after his letter to Yukawa. A similar work on the proton-neutron binding by Bethe and Peierls appeared in the literature in 1935' (Toshimitsu Yamazaki, 'Interplay between Yukawa and Tomonaga in the Birth of Mesons', Invited talk at the Yukawa session of the International Nuclear physics Conference, Tokyo, June 2007; available on the Nishina Memorial Foundation Web site). N° de ref. del artículo 19151

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