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First observation of excited states in 118Ba: Possible evidence for octupole correlations in neutron-deficient barium isotopes

J. F. Smith, C. J. Chiara, D. B. Fossan, G. J. Lane, J. M. Sears, I. Thorslund, H. Amro, C. N. Davids, R. V. F. Janssens, D. Seweryniak, I. M. Hibbert, R. Wadsworth, I. Y. Lee, and A. O. Macchiavelli
Phys. Rev. C 57, R1037(R) – Published 1 March 1998
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Abstract

Excited states have been observed for the first time in the very neutron-deficient 118Ba nuclide. The ground-state band and a side band have been observed up to spins 20 and 17 ħ, respectively. The bands have been assigned to 118Ba using gamma-recoil and gamma-x ray coincidences. Excitation-energy systematics suggest that the ground state of 118Ba is less deformed than that of 120Ba. The side band decays into the ground-state band via three transitions, which are presumed to have E1 character. The occurrence of E1 transitions and negative-parity states in the very neutron-deficient barium (Z=56) isotopes is discussed with respect to the possible onset of octupole correlations.

  • Received 5 November 1997

DOI:https://doi.org/10.1103/PhysRevC.57.R1037

©1998 American Physical Society

Authors & Affiliations

J. F. Smith1,*, C. J. Chiara1, D. B. Fossan1, G. J. Lane1, J. M. Sears1, I. Thorslund1, H. Amro2, C. N. Davids2, R. V. F. Janssens2, D. Seweryniak2, I. M. Hibbert3, R. Wadsworth3, I. Y. Lee4, and A. O. Macchiavelli4

  • 1Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800
  • 2Argonne National Laboratory, Argonne, Illinois 60439
  • 3Department of Physics, University of York, Heslington, York, YO1 5DD United Kingdom
  • 4Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

  • *E-mail: jfsmith@nuclear.physics.sunysb.edu

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Vol. 57, Iss. 3 — March 1998

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