Abstract
A direct determination has been made of the Fierz interference term b for the pure Gamow-Teller decay of 58Co. The K/β+ ratio has been determined by an internal source scintillation counter coincidence method. The value obtained was 4.92 ± 0.09. This may be compared with the recent predicted value of 4.87. Allowing for the variation in the theoretical value arising from β+ end point uncertainty this yields a value for b of (+0.6 ± 2.3)%. Two interpretations of the result are possible on the basis of two-component neutrino theory. If, as is customarily assumed, CA = CA', CT = -CT', then b should vanish identically; and the small experimental value for b confirms the theory. If alternatively, CA = CA', CT = +CT' then the experimental result requires that CT, CT' be very small.
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