Deformation of rotational structures in Kr73 and Rb74: Probing the additivity principle at triaxial shapes

F. Johnston-Theasby, A. V. Afanasjev, C. Andreoiu, R. A. E. Austin, M. P. Carpenter, D. Dashdorj, S. J. Freeman, P. E. Garrett, J. Greene, A. Görgen, D. G. Jenkins, P. Joshi, A. O. Macchiavelli, F. Moore, G. Mukherjee, W. Reviol, D. Sarantites, D. Seweryniak, M. B. Smith, C. E. Svensson, J. J. Valiente-Dobón, R. Wadsworth, and D. Ward
Phys. Rev. C 78, 034312 – Published 18 September 2008

Abstract

Lifetimes have been deduced in the intermediate/high-spin range for the three known rotational bands in Kr73 and the T=0 band in Rb74 using the residual Doppler shift method. This has enabled relative transition quadrupole moments to be studied for the first time in triaxial nuclei as a function of spin. The data suggest that the additivity principle for transition quadrupole moments is violated, a result that is in disagreement with predictions from cranked Nilsson-Strutinsky and cranked relativistic mean-field theory calculations. The reasons for the discrepancy are not understood but may indicate that important correlations are missing from the models.

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  • Received 14 May 2008

DOI:https://doi.org/10.1103/PhysRevC.78.034312

©2008 American Physical Society

Authors & Affiliations

F. Johnston-Theasby1, A. V. Afanasjev2,3, C. Andreoiu4, R. A. E. Austin5, M. P. Carpenter6, D. Dashdorj7, S. J. Freeman8, P. E. Garrett4,9, J. Greene6, A. Görgen10, D. G. Jenkins1, P. Joshi1, A. O. Macchiavelli11, F. Moore6, G. Mukherjee6,*, W. Reviol12, D. Sarantites12, D. Seweryniak6, M. B. Smith9, C. E. Svensson4, J. J. Valiente-Dobón13, R. Wadsworth1, and D. Ward11

  • 1Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 2Department of Physics and Astronomy, Mississippi State University, Mississippi 39762, USA
  • 3Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31, Latvia
  • 4Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
  • 5Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4K1, Canada
  • 6Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 7North Carolina State University, Raleigh, North Carolina 27695, USA
  • 8Department of Physics and Astronomy, University of Manchester, Manchester M15 9PL, United Kingdom
  • 9TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
  • 10CEA Saclay, IRFU/Service de Physique Nucleaire, F-91191 Gif-sur-Yvette, France
  • 11Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 12Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
  • 13INFN, Laboratori Nazionali di Legnaro, I-35020, Legnaro, Italy

  • *Present address: Variable Energy Cyclotron Centre, Kolkata 700064, India.

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Vol. 78, Iss. 3 — September 2008

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