High-spin structures in 155Tb and signature splitting systematics of the πh11/2 bands in odd A160 nuclei

D. J. Hartley, T. B. Brown, F. G. Kondev, J. Pfohl, M. A. Riley, S. M. Fischer, R. V. F. Janssens, D. T. Nisius, P. Fallon, W. C. Ma, and J. Simpson
Phys. Rev. C 58, 2720 – Published 1 November 1998
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Abstract

The reactions 152Sm(7Li,4n) at 45 MeV and 124Sn(36S,p4n) at 165 MeV were used to study high-spin states of the N=90 nucleus 155Tb. Previously known bands have been greatly extended in spin (I45ħ) and a new decoupled sequence was identified. Several band crossings or quasiparticle alignments have been observed in each of the structures, and as a result a configuration assignment has been given to the new band. B(M1)/B(E2) transition strength ratios have been extracted from the data and comparisons were made with theoretical predictions. A comprehensive analysis of the signature splitting in the energy levels and B(M1)/B(E2) ratios for the πh11/2 bands of the A160 region has been performed. Possible interpretations for the observed trends in the signature splitting of these structures are discussed.

  • Received 22 June 1998

DOI:https://doi.org/10.1103/PhysRevC.58.2720

©1998 American Physical Society

Authors & Affiliations

D. J. Hartley*, T. B. Brown, F. G. Kondev, J. Pfohl, and M. A. Riley

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

S. M. Fischer, R. V. F. Janssens, and D. T. Nisius

  • Argonne National Laboratory, Argonne, Illinois 60439

P. Fallon

  • Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

W. C. Ma

  • Department of Physics, Mississippi State University, Starkville, Mississippi 39762

J. Simpson

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

  • *Present address: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996.

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Vol. 58, Iss. 5 — November 1998

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