A new experiment to investigate the isospin sensitivity of the parity nonconserving (PNC) interaction in light nuclei is proposed. The observable is the PNC asymmetry for the emitted gamma rays from the $1^{\mathrm{-}}$1 state in ${}_{}{}^{20}{}_{}{}^{}\mathrm{F}$ (${\mathit{E}}_{\mathit{x}}$=0.983 MeV) partially polarized in the reaction ${}_{}{}^{22}{}_{}{}^{}\mathrm{Ne}$(d→,${\mathrm{\alpha }}_3$${)}^{20}$F, which is predicted in the range (2.4–5.8 )×${10}^{\mathrm{-}5}$. The structure parts of the components of the PNC matrix elements have been carefully calculated for the analysis of the experimental result in terms of the weak coupling constants. A new class of diagrams contributing to the PNC matrix elements has been included for the first time.

• Received 19 May 1992

DOI:https://doi.org/10.1103/PhysRevC.48.R522