Despite significant theoretical efforts, the CREX-PREX dilemma remains unresolved, preventing the reliable prediction of neutron (or weak-charge) radii that, besides their intrinsic nuclear-structure interest, often serve to quantify the impact of nuclear uncertainties in searches for new physics. Coherent elastic neutrino-nucleus scattering is a clean and attractive portal to new physics, whose sensitivity may be impacted by such nuclear uncertainties. In this paper I use CREX as the basis, together with a strong calcium-argon correlation, to provide a robust baseline for the weak radius of ${}^{40}\mathrm{Ar}$: $R_{\mathrm{wk}}^{40}=3.452\pm 0.028\text{(stat)}\pm 0.022\text{(syst)}\text{fm}$. The weak radius of argon is an observable, highly relevant to ongoing and future liquid-argon campaigns, that encodes the loss of coherence at small momentum transfers.

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• Electroweak interactions in nuclear physics
• Neutron skin thickness
• Nuclear radii
• Nuclear structure & decays
• 39 ≤ A ≤ 58