Elastic scattering of 180-MeV TT + and K~ on 3 He and tritium has been measured from .0 7r (c.m.)=44° to 96°. The superratio R = lda(7r + + 3 H)Afo(7r~ + 3 He)]/[rfo-(7r + + 3 He)Afo(7r" + 3 H)] is found to vary with angle reaching a maximum of 1.31 ±0.09 at Q^ = 65°. The direct Coulomb effects do not account for the observed differences of R from 1.0 which is the expected value on the basis of charge symmetry. PACS numbers: 25.80.Dj, ll.30.Er,-13.75.Gx, 25.10.+ S We present here the results of a novel test of the validity of charge symmetry (CS) at intermediate energy based on measurements of the superratio, R, which we have defined as the ratio of ratios of two pairs of charge-conjugate reactions, R = d(j{7i + + 3 E)/d(j(iT-+ 3 He) d
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