[en] We report on a recent search for bar ν_e appearance from stopped π⁺ → μ⁺ν_μ and μ⁺ → e⁺ν_e bar ν_μ decay made by the LAMPF experiment E645. The appearance of bar ν_e may occur from bar ν_μ → bar ν_e, ν_e → bar ν_eL, or ν_μ → bar ν_eL oscillations. Appearance may also occur from rare μ⁺ → e⁺bar ν_eν_μ decay, which is allowed by a multiplicative lepton charge conservation law. The neutrino energies range from E_ν = 0 to 52.8MeV. The neutrino detector, which is located 26.1 meters from the neutrino source, consists of a segmented liquid scintillator and proportional drift tube central detector surrounded by both active and passive shielding. The central detector detects bar ν_e through the bar ν_ep → ne⁺ Charge Current (CC) reaction, which is signaled by the direct detection of the final state positron and neutron. The hydrogen-rich liquid scintillators act as free proton targets for the bar ν_ep CC reaction. The neutrons are detected through radiative neutron capture on gadolinium. We find no evidence for bar ν_e appearance in the first year of running. New limits on the bar ν_μ,ν_e,ν_μ → bar ν_e oscillation parameters and the rare μ⁺ → e⁺bar ν_eν_μ decay branching ratio are presented. 87 refs., 45 figs., 17 tabs