We have examined the effects of nuclear and nucleon structure on the parity-violating asymmetry in elastic scattering of polarized electrons from ${}_{}{}^4{}_{}{}^{}\mathrm{He}$. We find that a small T=1 component in the ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ ground state will produce a less than 1% correction to the parity-violating asymmetry, while typical strangeness admixtures in the nucleon will produce a contribution which can be reliably determined in a high-precision experiment.

• Received 4 April 1994

DOI:https://doi.org/10.1103/PhysRevC.50.1175