Abstract

The first experimental evidence for electron correlation in nuclear electron-capture ratios is reported. The measured $\frac{M}{L}$ capture ratio of $^{37}\mathrm{Ar}$, 0.073\ifmmode\pm\else\textpm\fi{}0.007, is inconsistent with Hartree-Fock calculations, but can be explained by final-state correlation, if the disputed $3s3{p}^{6}$ assignment in Cl i is adopted. The discrepancy in the experimental $\frac{K\ensuremath{\beta}}{K\ensuremath{\alpha}}$ x-ray intensity ratio of Cl is removed, and the designation of ${L}_{23}$ x-ray and $3s$ photoemission satellites in Cl is revised.

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