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arXiv · 1203.4630

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

R. Winkler·A. Gade·T. Baugher·D. Bazin·B. A. Brown·T. Glasmacher·G. F. Grinyer·R. Meharchand·S. McDaniel·A. Ratkiewicz·D. Weisshaar
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Abstract

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

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R. Winkler, A. Gade, T. Baugher, D. Bazin, B. A. Brown, T. Glasmacher, G. F. Grinyer, R. Meharchand, S. McDaniel, A. Ratkiewicz, D. Weisshaar. 2012-03-21. Quadrupole collectivity beyond N=28: Intermediate-energy Coulomb excitation of 47,48Ar. https://doi.org/10.1103/physrevlett.108.182501

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