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Three events for the decay K+-->pi+ nunu have been observed in the pion momentum region below the K+-->pi+pi0 peak, 140 < Ppi < 199 MeV/c, with an estimated background of 0.93+/-0.17(stat.) -0.24+0.32(syst.) events. Combining this observation with previously reported results yields a branching ratio of B(K+-->pi+ nunu) = (1.73(-1.05)+1.15) x 10(-10) consistent with the standard model prediction.

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Measurements were made of the average energy 8' per ion pair formed in liquid xenon by internal-conversion electrons from~Bi. We observed voltage pulses resulting from electron collection either in liquid xenon or in a gaseous mixture of argon (95%I and methane (5%). The relative pulse heights for the two material. s determine the ratio of the W values. Using the known W for the gaseous mixture, we obtained a liquid-xenon 8' of 15.6+ 0.3 eV. This value is considerably smaller than the gas-phase values, 21.5 or 21.9 eV. For interpretation, we adapted Platzman's energy-balance equation to liquids, assuming a conduction-band picture. Theoretical values thus calculated agree well with experiment.