On The Two-Meson Theory

概要

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Main consequences of the two-meson theory by Marshak and Bethe on the one hand and that by Sakata are compared with experiments concerning π- and μ-mesons. It is shown that tha pair type interaction between π-mesons and nucleons in"M.B."theory contradicts with frequent occurrence of stars produced by π-mesons, whereas the assumption in Sakata theory that π-mesons with spin 0 or 1 are responsible for nuclear forces does not. Although the smaller range for the nuclear forces thus obtained from the latter theory is not at variance with the high energy neutron-proton scattering experiment, deuteron quadrupole moment cannot be accounted for by a π-meson field alone, so that the admixture of another meson field with larger range is necessitated. Both π-μ-decay and μ-nuclear capture can be consistently accounted for by assuming spin 1 / 2 for μ-mesons as in Sakata theory. However, nuclear β-decay and μ-β-decay have to be considered as direct processes as in Fermi's theory of β-decay, instead of indirect processes through virtual emission and absorption of π-mesons as assumed usually in the meson theory.
理論物理学刊行会の論文