Measurement of the parity non-conserving spin rotation of cold neutrons through a liquid helium target

In Nucleon-Nucleon interactions, the weak interaction properties are not well understood. Meson exchange models use several couplings to describe the interaction, but most of these couplings are not well known. Constraints of them must come from experiments.;We focused on the parity non-conserving spin rotation of the transversely polarized neutrons passing through liquid helium, which in meson exchange models is strongly correlated to the pion exchange coupling, f pi, and the rho exchange coupling h0r .;The experiment used a magnetically shielded multi-chamber liquid helium target, to neutralize the much larger parity conserving spin rotations from environmental B field, and to isolate the desired parity violating rotation. The experiment was designed to achieve a sensitivity goal of ∼3.0 x ∼10 -7 rad/m. In this thesis we describe the theory, apparatus, and the result of the analysis of the data taken at NIST.