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We present high accuracy relativistic coupled cluster calculations of theP-odd interaction coefficient $W_A$ describing the nuclear anapole momenteffect on the molecular electronic structure. The molecule under study, BaF, isconsidered a promising candidate for the measurement of the nuclear anapolemoment, and the preparation for the experiment is now underway [Altunas et al.,Phys. Rev. Lett. 120, 142501 (2018)]. Influence of various computationalparameters (size of the basis set, treatment of relativistic effects, andtreatment of electron correlation) on the calculated $W_A$ coefficient isinvestigated and a recommended value of 147.7 Hz with an estimated uncertaintyof 1.5% is proposed.

The nuclear anapole moment interaction in BaF from relativistic coupled cluster theory