CHARGE-SYMMETRY VIOLATION IN NEUTRON-PROTON ELASTIC-SCATTERING AT EN = 183 MEV

Measurements of the spin dependence of n-p elastic scattering at E(n) = 183 MeV have been carried out with polarized neutrons and polarized protons. If charge symmetry holds, the two analyzing powers A(n) and A(p) must be equal. The measured value of DELTA-A = A(n) - A(p), averaged over the angular range 82.2-degrees less-than-or-equal-to theta-c.m. less-than-or-equal-to 116.1-degrees, is (33.1 +/- 5.9 +/- 4.3) x 10(-4). This result represents clear evidence of charge-symmetry violation in the strong interaction. The measurement agrees well with predictions from meson-exchange theory when these include the isospin mixing of the rho-0 and omega-0 mesons.