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The Lancaster experiments with a cylindrical wire moving in superfluid 3He-Bare discussed, where the measured critical velocity of pair creation is muchbelow the Landau critical velocity. The phenomenon is shown to be analogous tothe instability of the electron-positron vacuum in an adiabatically alternatingstrong electric potential of both signs, where the positive- and negative-rootlevels cross and thus the instability treshold is twice less than in theconventional case of a single static potential well.Comment: RevTex file, 6 pages, 4 figure

Critical velocity in 3He-B vibrating wire experiments as analog of vacuum instability in a slowly oscillating electric field