Neutron diffraction of CsCuCl3 revealed a sixfold modulation of the he
lix along the c-axis, consistent with NMR results. The critical expone
nt of magnetization beta was found to be 0.25 +/- 0.01, as expected fr
om chiral symmetry, S-1 X Z(2). The observed magnetic excitation energ
y can be interpreted by the spin wave theory.