Rotational structures in 155Eu and 157Tb

D. J. Hartley, M. A. Riley, D. E. Archer, T. B. Brown, J. Döring, R. A. Kaye, F. G. Kondev, T. Petters, J. Pfohl, R. K. Sheline, S. L. Tabor, and J. Simpson
Phys. Rev. C 57, 2944 – Published 1 June 1998
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Abstract

High-spin states of 157Tb were populated via the reactions 154Sm(7Li,4n) at 35 MeV and 150Nd(11B,4n) at 55 MeV. Previously known bands have been extended and one new structure has been identified. The rotational alignment behavior of the bands and band crossing systematics have been analyzed. Experimental B(M1)/B(E2) ratios for the strongly coupled bands have been extracted and compared with theoretical predictions. New results were also obtained for the N=92 isotone 155Eu. The [411]3/2 and [413]5/2 pseudo-spin partner bands were observed in both nuclei. Experimental B(E1)/B(E2) ratios have been determined in both 155Eu and 157Tb. However, the estimated large B(E1) strengths can be explained without static octupole deformation. The [411]3/2 bands in 155Eu and 157Tb have been found identical up to spin I=232, which might be explained by changes in deformation.

  • Received 28 January 1998

DOI:https://doi.org/10.1103/PhysRevC.57.2944

©1998 American Physical Society

Authors & Affiliations

D. J. Hartley, M. A. Riley, D. E. Archer*, T. B. Brown, J. Döring, R. A. Kaye, F. G. Kondev, T. Petters, J. Pfohl, R. K. Sheline, and S. L. Tabor

  • Department of Physics, Florida State University, Tallahassee, Florida 32306

J. Simpson

  • CCLRC, Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom

  • *Present address: Lawrence Livermore National Laboratory, Livermore, California 94550.
  • Present address: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556.

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Vol. 57, Iss. 6 — June 1998

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