High-precision quadrupole moment reveals significant intruder component in Al201333 ground state

H. Heylen, M. De Rydt, G. Neyens, M. L. Bissell, L. Caceres, R. Chevrier, J. M. Daugas, Y. Ichikawa, Y. Ishibashi, O. Kamalou, T. J. Mertzimekis, P. Morel, J. Papuga, A. Poves, M. M. Rajabali, C. Stödel, J. C. Thomas, H. Ueno, Y. Utsuno, N. Yoshida, and A. Yoshimi
Phys. Rev. C 94, 034312 – Published 12 September 2016

Abstract

The electric quadrupole moment of the Al201333 ground state, located at the border of the island of inversion, was obtained using continuous-beam β-detected nuclear quadrupole resonance (β-NQR). From the measured quadrupole coupling constant νQ=2.31(4) MHz in an αAl2O3 crystal, a precise value for the electric quadrupole moment is extracted: QsAl33=141(3) mb. A comparison with large-scale shell model calculations shows that Al33 has at least 50% intruder configurations in the ground state wave function, favoring the excitation of two neutrons across the N=20 shell gap. Al33 therefore clearly marks the gradual transition north of the deformed Na and Mg nuclei towards the normal Z14 isotopes.

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  • Received 5 July 2016

DOI:https://doi.org/10.1103/PhysRevC.94.034312

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

H. Heylen1, M. De Rydt1, G. Neyens1,*, M. L. Bissell1, L. Caceres2, R. Chevrier3, J. M. Daugas3, Y. Ichikawa4,†, Y. Ishibashi4,5, O. Kamalou2, T. J. Mertzimekis6, P. Morel3, J. Papuga1, A. Poves7, M. M. Rajabali1, C. Stödel2, J. C. Thomas2, H. Ueno4, Y. Utsuno8,9, N. Yoshida10, and A. Yoshimi4,‡

  • 1KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
  • 2Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, France
  • 3CEA, DAM, DIF, F-91297 Arpajon Cedex, France
  • 4RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 5Institute of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
  • 6Department of Physics, University of Athens, Zografou Campus, GR-15784, Athens, Greece
  • 7Departamento de Física Teórica and IFT-UAM/CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
  • 8Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 9Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 10Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan

  • *gerda.neyens@kuleuven.be
  • Present address: Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.
  • Present address: Research Core for Extreme Quantum World, Okayama University, Okayama 700-8530, Japan.

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Vol. 94, Iss. 3 — September 2016

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