This approach was followed for the vector current in the second paper in Ref. 5.~S ee the first paper in Ref. 5, and references therein. See, also, E. J. Konopinski, The Theory of Beta Radioactivity (Clarendon Press, Oxford, England, 1966). J. Sodermann and A. Winther, Nucl. Phys. 69, 369 (1965). We have assumed that Iz(0) &0 and f";y(0) &0.~4 Y. Nambu, Phys. Rev. Letters 4, 380 (1960). See the second paper in Ref. 1.6For P+ decay, C is negative so that a more careful analysis is necessary.We have assumed that f&(0) & 0 and f"'f(0)~0. It should be noted that if f&(0) =0, an entirely different result follows.Note that in Eq. (76) the contribution of the f2 term appears to be [Wo/(m;+mf)](f2/f&), but when combined with the lepton part, it is [m, /(m;+m&)](f2/f(). Reddy, Nuovo Cimento 3A, 699 (1971) for the latest list of references.A preliminary discussion of these results appears in Phys. Letters 41B, 39 (1972).

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