Reduced transition probabilities of vibrational states in Dy156,158, Er162,164, and Yb168

R. M. Ronningen, R. S. Grantham, J. H. Hamilton, R. B. Piercey, A. V. Ramayya, B. van Nooijen, H. Kawakami, W. Lourens, R. S. Lee, W. K. Dagenhart, and L. L. Riedinger
Phys. Rev. C 26, 97 – Published 1 July 1982
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Abstract

The vibrational states of Dy156,158, Er162,164, and Yb168 have been studied via Coulomb excitation. Thin high purity targets were prepared in an isotope separator. The Coulomb excitation of these nuclei was studied by the scattering of 12-16 MeV α particles, which were detected in an Enge split-pole spectrograph. The reduced transition probabilities B(Eλ;0g.s.+IπK) were obtained for IπK=2+2, 2+0, and Iπ=3 states in each nucleus. Limits on B(Eλ) values and values extracted from published (d, d) cross sections are also presented. Trends in B(E2) values and energy levels for the Dy, Er, and Yb nuclei show that the Kπ=2+ levels are reasonably constant in energy for only Dy and Er. In all three nuclei B(E2) values decrease with increasing neutron number. Except for the Dy isotopes, the lightest isotope has the largest B(E2) value for the lowest lying IπK=2+0 state. Iπ=3 states level energies and B(E3) values are found to be in fair agreement with microscopic calculations. Values of B(E2) for Kπ=2+ states are in fair agreement with microscopic calculations when these exist.

NUCLEAR REACTIONS Dy156,158(α, α), Er162,164(α, α), Yb168(α, α), E=1216 MeV; measured σ, deduced B(Eλ). Enriched targets.

  • Received 25 January 1982

DOI:https://doi.org/10.1103/PhysRevC.26.97

©1982 American Physical Society

Authors & Affiliations

R. M. Ronningen*, R. S. Grantham, J. H. Hamilton, R. B. Piercey, A. V. Ramayya, B. van Nooijen, H. Kawakami, W. Lourens, and R. S. Lee

  • Department of Physics, Vanderbilt University, Nashville, Tennessee 37235

W. K. Dagenhart

  • Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

L. L. Riedinger

  • Department of Physics, University of Tennessee, Knoxville, Tennessee 37916

  • *Present address: Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824.
  • On leave from Delft Technical University, Delft, The Netherlands.
  • On leave from University of Tokyo, Tokyo, Japan.

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Vol. 26, Iss. 1 — July 1982

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