Quadrupole collectivity beyond N=50 in neutron-rich Se and Kr isotopes

B. Elman, A. Gade, D. Weisshaar, D. Barofsky, D. Bazin, P. C. Bender, M. Bowry, M. Hjorth-Jensen, K. W. Kemper, S. Lipschutz, E. Lunderberg, N. Sachmpazidi, N. Terpstra, W. B. Walters, A. Westerberg, S. J. Williams, and K. Wimmer
Phys. Rev. C 96, 044332 – Published 27 October 2017

Abstract

We report B(E2;01+2n+) strengths for the neutron-rich Kr88,90 and Se86 isotopes from intermediate-energy Coulomb excitation. The electric quadrupole transition strengths to the first 2+ states complete, with considerably improved uncertainties, the evolution of quadrupole collectivity in the Kr and Se isotopes approaching N=60, for which Kr90 and Se86 had previously been the most uncertain. We also report significant excitation strength to several higher-lying 2+ states in the krypton isotopes. This fragmentation of B(E2) strength in Kr88,90 confirms shell-model calculations in the π(fpg)ν(sdgh) shell with an only minimally tuned shell-model setup that is based on a nucleon-nucleon interaction derived from effective field theory and effective charges adjusted to Kr86.

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  • Received 7 July 2017

DOI:https://doi.org/10.1103/PhysRevC.96.044332

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

B. Elman1,2, A. Gade1,2, D. Weisshaar1, D. Barofsky3,*, D. Bazin1, P. C. Bender1, M. Bowry1,†, M. Hjorth-Jensen1,2,4, K. W. Kemper5, S. Lipschutz1,2, E. Lunderberg1,2, N. Sachmpazidi3, N. Terpstra3, W. B. Walters6, A. Westerberg3, S. J. Williams1,‡, and K. Wimmer1,3,§

  • 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
  • 3Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
  • 4Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway
  • 5Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
  • 6Department of Chemistry, University of Maryland, College Park, Maryland 20742, USA

  • *Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3.
  • Present address: Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom.
  • §Present address: Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

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Issue

Vol. 96, Iss. 4 — October 2017

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