7r-4 He inelastic cross sections have been measured at r ff =180 MeV. In the region of the J w = 1" states (£* -23 to 30 MeV) the 7r + /7r~ cross-section ratio R n was found to be 1.05 ±0.08 at ^lab^O 0 . Such a small deviation from 1.0 implies that isospin mixing between the T = 0 and T-\ states in 4 He is quite weak, in striking contrast to the strong isospin mixing deduced from the large ratio of photonucleon cross sections, R y =
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