Parity-nonconserving optical rotation has been observed and measured on the 8757-A magnetic-dipole absorption line in atomic bismuth vapor. The result, R = Im(E i /M i ) = (-10.4± 1.7) x 10" 8 , is of the approximate size calculated with use of the Weinberg-Salam theory of the weak neutral-current interaction with sin 2 0 w = 0.23.
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