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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Br ions with energies of 13.9 and 25 MeV from the Oak Ridge tandem accelerator have been used to measure ionic charge-state distributions in dilute gas targets of H2, He, and Ar. A least-squares technique has been developed to obtain complete sets of electron charge-exchange cross sections from any number and range of measured nonequilibrium charge distributions. Characteristic irregularities, which originate in the atomic shell structure of the Br ions, have been found in the cross sections for capture of a sing]. e electron. Multiple electron capture and loss, as well as equilibrium charge distributions, are discussed,