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Snow","submitted_at":"2019-02-21T13:15:33Z","abstract_excerpt":"Neutron spin rotation is expected from quark-quark weak interactions in the Standard Model, which induce weak interactions among nucleons that violate parity. We present the results from an experiment searching for the effect of parity violation via the spin rotation of polarized neutrons in a liquid $^{4}$He medium. The value for the neutron spin rotation angle per unit length in $^{4}$He, $d\\phi/dz =(+2.1 \\pm 8.3 (stat.) \\pm 2.9 (sys.))\\times10^{-7}$ rad/m, is consistent with zero. 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