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

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

2012-03-21

arxiv.org/abs/1203.4630v2

Physics

Nuclear Physics

Nuclear Experiment

Accepted for publication in Physical Review Letters, typos fixed in resubmission on April 10

Scientific paper

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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