2) Uncertainties in the nuclear wave functions. More recent Cabibbo-model predictions 9 of P y cc (1.08 MeV) are in qualitative agreement with, and somewhat larger than, the results of Ref. 8.(3) The "enhancement factor" to be expected from the neutral weak currents is difficult to calculate precisely; current estimates 10 for the Weinberg-Salam model point to a value of about 10. The 18 F system is one of the most favorable cases, both experimentally and theoretically, for studying AT= 1 PNC forces. With the Cabibbomodel prediction of Ref. 8, the present experiment yields an upper limit of 7.5 for the "enhancement factor" produced by neutral weak currents. 11

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