Lifetimes of yrast and near-yrast states of 159,160,161Yb

M. P. Fewell, N. R. Johnson, F. K. McGowan, J. S. Hattula, I. Y. Lee, C. Baktash, Y. Schutz, J. C. Wells, L. L. Riedinger, M. W. Guidry, and S. C. Pancholi
Phys. Rev. C 37, 101 – Published 1 January 1988
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Abstract

Lifetimes of high-spin states of 159,160,161Yb, populated by fusion-evaporation reactions, have been measured by the recoil-distance technique. The data were collected in coincidence with a total-energy filter to provide some discrimination on reaction channel. The principal feature of the resulting transition quadrupole moments is a frequency-dependent reduction which is displayed by those bands with aligned quasiparticles. This seems to be mainly due to the influence of the favored i13/2 quasineutron. Additional available data are surveyed and support this conclusion. Calculations using the cranked shell model and the cranked Hartree-Fock-Bogoliubov and cranked Nilsson-Strutinsky methods provide a qualitative description of the experimental observations. In addition, a satisfactory account is provided by recent calculations based on a fermion dynamical-symmetry model.

  • Received 20 July 1987

DOI:https://doi.org/10.1103/PhysRevC.37.101

©1988 American Physical Society

Authors & Affiliations

M. P. Fewell, N. R. Johnson, F. K. McGowan, J. S. Hattula, I. Y. Lee, C. Baktash, and Y. Schutz

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

J. C. Wells

  • Tennessee Technological University, Cookeville, Tennessee 38505
  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

L. L. Riedinger and M. W. Guidry

  • University of Tennessee, Knoxville, Tennessee 37996
  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

S. C. Pancholi

  • University of Delhi, Delhi 110007, India
  • Vanderbilt University, Nashville, Tennessee 37325

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Vol. 37, Iss. 1 — January 1988

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