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Testing mean-field models near the N=Z line: γ-ray spectroscopy of the Tz=12 nucleus 73Kr

N. S. Kelsall1, S. M. Fischer2, D. P. Balamuth3, G. C. Ball4, M. P. Carpenter5, R. M. Clark6, J. Durell7, P. Fallon6, S. J. Freeman7 et al.

P. A. Hausladen3, R. V. F. Janssens5, D. G. Jenkins3,5,*, M. J. Leddy7, C. J. Lister5, A. O. Macchiavelli6, D. G. Sarantites8, D. C. Schmidt2, D. Seweryniak5, C. E. Svensson6,†, B. J. Varley7, S. Vincent9,‡, R. Wadsworth1, A. N. Wilson1,§, A. V. Afanasjev5,9,∥, S. Frauendorf9, I. Ragnarsson10, and R. Wyss11

  • 1Department of Physics, University of York, Heslington, York Y010 5DD, Uninted Kingdom
  • 2Department of Physics, DePaul University, Chicago, Illinois 60614
  • 3Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104
  • 4TRIUMF Laboratory, 4004 Westbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
  • 5Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
  • 6Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
  • 7Department of Physics, University of Manchester, Manchester M13 9PL, United Kingdom
  • 8Department of Chemistry, Washington University, St. Louis, Missouri 63130
  • 9Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
  • 10Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund, Sweden
  • 11The Royal Institute of Technology, Physics Department Frescati, S-104 05 Stockholm, Sweden

  • *Present address: Department of Physics, University of Liverpool, Liverpool, L69 7ZE, UK.
  • †Present address: Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
  • ‡Present address: Physics Department, University of Surrey, Guildford, Surrey GU2 7XH, UK.
  • §Present address: Department of Nuclear Physics, Australian National University, Canberra ACT0200, Australia.
  • ∥On leave of absence from Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31, Latvia.
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Phys. Rev. C 65, 044331 – Published 5 April, 2002

DOI: https://doi.org/10.1103/PhysRevC.65.044331

Abstract

Excited states in the N=Z+1 nucleus 73Kr have been investigated using the 40Ca(36Ar,2pn) and 40Ca(40Ca,α2pn) reactions at 145 and 160 MeV, respectively. γ rays were detected using the Gammasphere array and events were recorded in coincidence with charged-particle and neutron detectors. The three previously observed bands were extended to high spin, and a new unfavored positive-parity band has been observed. The alignment characteristics and decay properties of the bands are all consistent with large-deformation prolate rotation, with no clear evidence for oblate bands or shape coexistence. This is quite different from neighboring 72,74Kr, indicating a strong shape-stabilizing role for the valence neutron. The experimental results are compared to extended total Routhian surface, cranked Nilsson Strutinsky, and cranked relativistic mean-field calculations. The results suggest that the paired calculations lack some important physics. Neutron-proton correlations may be the missing ingredient. There is also evidence for an unusual band crossing in the negative-parity bands, which may indicate the presence of T=0 pairing correlations. At high spin all the models can reproduce the experimental data.

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Phys. Rev. C 65, 044331– Published 5 April, 2002
  • Received 6 December 2001

© 2002 American Physical Society

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