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By L.L. Ivanov

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This suggests a kind of *) We assume that all fields are described by undors (reflection (34)]) and not by "quasi-undors" (reflection Iji' = ~Iji). (9), 3 34 F. J. BELINFANTE symmetry between both ways of describing physical situations *). By way of hypothesis one might assume that such a symmetry is a fundamental property of nature. ). Therefore we shall postulate that every physically significant quantity in quantum-mechanics (that is, every q-number correctly representing the value of an observable) is invariant by transition from one description of the fields of wave-functions to the chargeconjugated description, or, in shorter terms, is charge-£nvar£ant.

In order to explain the range of about 2 X 10-13 cm of the nuclear forces, he assumed that this quantum had a mass about 200 times as large as the electron mass: m R:i 200 m. In his original theory this field was tentatively regarded as a scalar field. Then, however, it turned out 2) that, if the energy of the field of heavy quanta was assumed to be positive, the exchange force between a proton and a neutron became repulsive in a 3S state, in contradiction to the fact that this is the ground state of the deuteron.

For this purpose we put ~ao = ~oa = Ea; ~bc = - ~cb = Ha;

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