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We report on the first experimental study of quadrupole collectivity in thevery neutron-rich nuclei \nuc{47,48}{Ar} using intermediate-energy Coulombexcitation. These nuclei are located along the path from doubly-magic Ca tocollective S and Si isotopes, a critical region of shell evolution andstructural change. The deduced $B(E2)$ transition strengths are confronted withlarge-scale shell-model calculations in the $sdpf$ shell using thestate-of-the-art SDPF-U and EPQQM effective interactions. The comparisonbetween experiment and theory indicates that a shell-model description of Arisotopes around N=28 remains a challenge.

Quadrupole collectivity beyond N=28: Intermediate-energy Coulomb excitation of 47,48Ar