Relativistic configuration-interaction study of the nuclear-spin-dependent parity-nonconserving electron-nucleus interaction constant $W_{\text{A}}$ in BaF

A fully relativistic restricted active space configuration-interaction method is employed to compute the $P$-odd electron-nucleus interaction constant $W_{\text{A}}$ for the ground $\left({{}^2\Sigma }_{1/2}\right)$ state of BaF, which yields the result of $W_{\text{A}}=160\text{Hz}$. Our present estimated result of the $P$-odd interaction constant $W_{\text{A}}$ is in reasonable agreement with previous calculations. This result will be useful for the interpretation of the nuclear-spin-dependent parity-nonconservation experiment on BaF.