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

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. PietrallaS. Pietri, W. Prokopowicz, H. Schaffner, R. Schwengner, H. -J. Wollersheim

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Abstract

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.
Original languageEnglish
Pages (from-to)110-114
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume695
Issue number1-4
DOIs
Publication statusPublished - 2011

Subject classification (UKÄ)

  • Subatomic Physics

Keywords

  • Lifetimes
  • Sn isotopes
  • Doppler shift attenuation technique

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