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Positive-muon spin rotation (mu+SR) measurements have been carried out in the new heavy-fermion superconductors UM2Al3, M = Ni and Pd. In UNi2Al3 the observed mu+ frequencies in zero applied field indicate commensurate antiferromagnetic (AF) ordering of U moments approximately 0.1-mu(B)/U atom. These moments coexist with superconductivity and have the highest values observed in an AF heavy-fermion superconductor. The absence of well-defined frequencies in zero-field mu+SR in the AF state of UPd2Al3 suggests symmetric mu+ stopping sites. In this system mu+SR linewidths below T(c) yield a preliminary value of approximately 8000 angstrom for the London penetration depth

? + SR studies of UM2Al3, M=Ni, Pd