Proposed Measurement of the Parity‐Violating Neutron Spin Rotation in 4He

Weak interactions between u and d quarks induce weak interactions between nucleons. These weak‐interaction effects can be isolated from strong interactions using parity‐violation (PV). The nucleon‐nucleon (NN) weak interaction amplitudes are constrained by neither theory nor experiment. We describe a proposed measurement of PV neutron spin rotation in liquid helium φPV(n,α) that is scheduled to run in 2006 with a sensitivity of 3×10−7 rad/m.