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Observations have been obtained through high-speed photography on the dynamics of the magnetically induced retrograde rotation of a low-pressure argon arc discharge. Two distinctly different cases of retrograde motion were observed. In one case, the cathode spots form an apparently continuous cathodic arc region; in the second case, groups of discrete cathode spots exist. The behavior of the positive column for the two cases is dissimilar. The mode of retrograde rotation which occurs is determined by the applied magnetic field strength.

K + mesons stopped in C3F8 in the Lawrence Radiation Laboratory (LRL) 30-inch heavy liquid bubble chamber were used in a study of the properties of the decay mode K+ -> ir 0 -\-jx + +v. The properties studied were the /*+ and ir° energy spectra, fx + longitudinal polarization, ju + total polarization, and K^+/K e9 + branching ratio. The data are consistent with the universal V-A theory, with time-reversal invariance, and fx-e universality. Using the usual form-factor phenomenological expression for the strangeness-changing vector current, we obtain:Re £= +0.34_o.26 +0 -42 , Im £= +0.69_i. 0 -H) -86 , X + =0.00±0.05, f+(£"•)//+(£.«) = 1.01±0.05. Im £ should vanish by time-reversal invariance and/ + (iC M 3)//+(i£e3) should be unity if n-e universality holds. With these assumptions we obtain Re £==0.41_o.22 +0 -27 . CALLAHANet at.