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Joakim

Joakim Cederkäll

Professor

Joakim

Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements

Author

  • A. Jungclaus
  • J. Walker
  • J. Leske
  • K. -H. Speidel
  • A. E. Stuchbery
  • M. East
  • P. Boutachkov
  • Joakim Cederkäll
  • P. Doornenbal
  • J. L. Egido
  • Andreas Ekström
  • J. Gerl
  • R. Gernhaeuser
  • N. Goel
  • M. Gorska
  • I. Kojouharov
  • P. Maier-Komor
  • V. Modamio
  • F. Naqvi
  • N. Pietralla
  • S. Pietri
  • W. Prokopowicz
  • H. Schaffner
  • R. Schwengner
  • H. -J. Wollersheim
Show all

Summary, in English

Precise measurements of the lifetimes of the first excited 2(+) states in the stable even-A Sn isotopes Sn112-124 have been performed using the Doppler shift attenuation technique. For the isotopes Sn-112, Sn-114 and Sn-116 the E2 transition strengths deduced from the measured lifetimes are in disagreement with the previously reported values and indicate a shallow minimum at N = 66. The observed deviation from a maximum at mid-shell is attributed to the obstructive effect of the S-1/2 neutron orbital in generating collectivity when near the Fermi level. (C) 2010 Elsevier B.V. All rights reserved.

Department/s

  • Nuclear physics

Publishing year

2011

Language

English

Pages

110-114

Publication/Series

Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

Volume

695

Issue

1-4

Document type

Journal article

Publisher

Elsevier

Topic

  • Subatomic Physics

Keywords

  • Lifetimes
  • Sn isotopes
  • Doppler shift attenuation technique

Status

Published

ISBN/ISSN/Other

  • ISSN: 0370-2693