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Quadrupole Collectivity beyond N=28: Intermediate-Energy Coulomb Excitation of Ar47,48

R. Winkler, A. Gade, T. Baugher, D. Bazin, B. A. Brown, T. Glasmacher, G. F. Grinyer, R. Meharchand, S. McDaniel, A. Ratkiewicz, and D. Weisshaar
Phys. Rev. Lett. 108, 182501 – Published 30 April 2012
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Abstract

We report on the first experimental study of quadrupole collectivity in the very neutron-rich nuclei Ar47,48 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-Uand 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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  • Received 27 February 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.182501

© 2012 American Physical Society

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Published 30 April 2012

Measurements of radioactive, neutron-rich isotopes of argon are paving the way for experiments at new facilities that will explore the neutron dripline.

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Authors & Affiliations

R. Winkler1,*, A. Gade1,2, T. Baugher1,2, D. Bazin1, B. A. Brown1,2, T. Glasmacher1,2, G. F. Grinyer1,†, R. Meharchand1,2,*, S. McDaniel1,2, A. Ratkiewicz1,2, and D. Weisshaar1

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA

  • *Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
  • Present address: Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France.

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Issue

Vol. 108, Iss. 18 — 4 May 2012

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