The reactions of muons in liquid hydrogen containing a low concentration of deuterium, pfi-\-d -> dp+p -» (djjip) + -> He 3 +^~(a) or (He 3 ju) + +7(b), and in liquid deuterium containing a low concentration of hydrogen, dtx+p-> (<^iO + ->He 3 +M~(c) or (He 3 /x) + +7(d), and djx+d-* (dfd) + ->H.e*+n+fT(e) or p+t+f(f) t have been investigated using the Chicago 9-in. bubble chamber. Using previously determined values for the formation and fusion rates of the (djjtp) + ion in hydrogen in conjunction with a theoretical determination of the population of the various hyperfine levels in the (djjtp) + ion, reaction (a) is found to occur in (15 ±1.5)% of all {dfxp) + fusion reactions. The formation rate of the (dixd) + ion in liquid deuterium is found to be X drf =(3.6±1.3)Xl0 5 sec" 1 . The fusion rate of the (dfid) + is X d / = (2.5±0.04)X10 5 sec" 1 , and the fraction of muons which, having catalyzed reaction (e), are subsequently bound in a (He 3 /0 + muonic ion is (0.31 ±0.0034). The rate of de-excitation to the lower hyperfine level of the d/j, muonic atom via the reaction dfi(3/2)+d-*d+dn(l/2) has been investigated and found to be (7.9±2.8)X10 5 sec-1 n-\-n-\-v is discussed.

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Among 546 000 negative pions stopping in a liquid hydrogen bubble chamber, 21 events were found corresponding to pion-muon decay in the backward hemisphere from a velocity ^ 0.006c. Analysis gives (2.3=t0.6)X 10~1 2 sec as the mean time for a pion to go from this velocity to nuclear capture. Results are also presented for the moderation time of pions between velocities 0.1c and 0.006c.