Enhanced Electric Dipole Strength for the Weakly Bound States in Ne27

C. Loelius, N. Kobayashi, H. Iwasaki, D. Bazin, J. Belarge, P. C. Bender, B. A. Brown, R. Elder, B. Elman, A. Gade, M. Grinder, S. Heil, A. Hufnagel, B. Longfellow, E. Lunderberg, M. Mathy, T. Otsuka, M. Petri, I. Syndikus, N. Tsunoda, D. Weisshaar, and K. Whitmore
Phys. Rev. Lett. 121, 262501 – Published 28 December 2018

Abstract

An enhanced low-energy electric dipole (E1) strength is identified for the weakly bound excited states of the neutron-rich isotope Ne27. The Doppler-shift lifetime measurements employing a combination of the γ-ray tracking array GRETINA, the plunger device, and the S800 spectrograph determine the lower limit of 0.030e2fm2 or 0.052 W.u. for the 1/2+3/2E1 transition in Ne27, representing one of the strongest E1 strengths observed among the bound discrete states in this mass region. This value is at least 30 times larger than that measured for the 3/2 decay to the 3/2gs+ ground state. A comparison of the present results to large-scale shell-model calculations points to an important role of core excitations and deformation in the observed E1 enhancement, suggesting a novel example of the electric dipole modes manifested in weakly bound deformed systems.

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  • Received 25 July 2018
  • Revised 7 November 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.262501

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

C. Loelius1,2, N. Kobayashi1,*, H. Iwasaki1,2,†, D. Bazin1, J. Belarge1, P. C. Bender1,‡, B. A. Brown1,2, R. Elder1,2, B. Elman1,2, A. Gade1,2, M. Grinder1,2, S. Heil3, A. Hufnagel3, B. Longfellow1,2, E. Lunderberg1,2, M. Mathy3, T. Otsuka1,4,5,6, M. Petri3,7, I. Syndikus3, N. Tsunoda4, D. Weisshaar1, and K. Whitmore1,2

  • 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
  • 3Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt D64289, Germany
  • 4Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku Tokyo, Japan
  • 5Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku Tokyo, Japan
  • 6RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
  • 7Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom

  • *Present address: Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
  • iwasaki@nscl.msu.edu
  • Present address: Department of Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA.

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Issue

Vol. 121, Iss. 26 — 28 December 2018

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