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Mapping the deformation in the “island of inversion”: Inelastic scattering of Ne30 and Mg36 at intermediate energies

P. Doornenbal, H. Scheit, S. Takeuchi (武内聡), N. Aoi (青井考), K. Li (李闊昂), M. Matsushita (松下昌史), D. Steppenbeck, H. Wang (王赫), H. Baba (馬場秀忠), E. Ideguchi (井手口栄治), N. Kobayashi (小林信之), Y. Kondo (近藤洋介), J. Lee (李曉菁), S. Michimasa (道正新一郎), T. Motobayashi (本林透), A. Poves, H. Sakurai (櫻井博儀), M. Takechi (武智麻耶), Y. Togano (栂野泰宏), and K. Yoneda (米田健一郎)
Phys. Rev. C 93, 044306 – Published 11 April 2016

Abstract

The transition strengths of the first-excited 2+ states and deformation lengths of the nuclei Ne30 and Mg36 were determined via Coulomb- and nuclear-force-dominated inelastic scattering at intermediate energies. Beams of these exotic nuclei were produced at the RIKEN Radioactive Isotope Beam Factory and were incident on lead and carbon targets at energies above 200 MeV/u. Absolute excitation cross sections on the lead target yielded reduced transition probabilities of 0.0277(79) and 0.0528(121) e2b2, while the measurements with the carbon target revealed nuclear deformation lengths of δN=1.98(11) and 1.93(11) fm for Ne30 and Mg36, respectively. Corresponding quadrupole deformation parameters of β20.5 from the two probes were found comparable in magnitude, showing no indication for a reduction in deformation along isotopic and isotonic chains from Mg32 towards the neutron drip-line. Comparisons to shell-model calculations illustrate the importance of neutron excitations across the N=20 shell for Ne30 and suggest that shallow maximums of collectivity may occur around N=22 and 24 along the neon and magnesium isotopic chains, respectively.

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  • Received 4 January 2016

DOI:https://doi.org/10.1103/PhysRevC.93.044306

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

P. Doornenbal1,*, H. Scheit1,2,†, S. Takeuchi (武内聡)1,‡, N. Aoi (青井考)1,§, K. Li (李闊昂)1,2, M. Matsushita (松下昌史)1,3,∥, D. Steppenbeck1, H. Wang (王赫)1,2, H. Baba (馬場秀忠)1, E. Ideguchi (井手口栄治)4,§, N. Kobayashi (小林信之)5,**, Y. Kondo (近藤洋介)5, J. Lee (李曉菁)1,††, S. Michimasa (道正新一郎)4, T. Motobayashi (本林透)1, A. Poves6, H. Sakurai (櫻井博儀)1, M. Takechi (武智麻耶)1,‡‡, Y. Togano (栂野泰宏)1,‡, and K. Yoneda (米田健一郎)1

  • 1RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
  • 2Peking University, Beijing 100871, People's Republic of China
  • 3Department of Physics, Rikkyo University, Toshima, Tokyo 172-8501, Japan
  • 4Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
  • 5Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
  • 6Departamento de Física Teorica and IFT-UAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain

  • *pieter@ribf.riken.jp
  • Present address: Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany.
  • Present address: Department of Physics, Tokyo Institute of Technology, Tokyo, Japan.
  • §Present address: Research Center for Nuclear Physics, Osaka University, Osaka, Japan.
  • Present address: Center for Nuclear Study, University of Tokyo, Tokyo, Japan.
  • **Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA.
  • ††Present address: Department of Physics, The University of Hong Kong, Hong Kong.
  • ‡‡Present address: Graduate School of Science and Technology, Niigata University, Niigata, Japan.

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Vol. 93, Iss. 4 — April 2016

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