Search for the Jacobi shape transition in rapidly rotating nuclei

D. Ward, R. M. Diamond, W. J. Swiatecki, R. M. Clark, M. Cromaz, M. A. Deleplanque, P. Fallon, A. Goergen, G. J. Lane, I. Y. Lee, A. O. Macchiavelli, W. Myers, F. S. Stephens, C. E. Svensson, and K. Vetter
Phys. Rev. C 66, 024317 – Published 23 August 2002
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Abstract

We have studied quasicontinuous gamma radiation from reactions of 48Ca beams on targets of 50Ti, 64Ni, 96Zr, and 124Sn. The bombarding energies were in the range 195–215 MeV, and were chosen so as to bring in a high angular momentum without severe fragmentation of the cross sections for fusion residues. Experiments were performed both with the 8PI spectrometer at the LBNL 88-Inch Cyclotron, and with Gammasphere at the ANL ATLAS accelerator. The results have been analyzed in a variety of ways, with the consistent result that in all but the heaviest target, the nuclear moments of inertia tend to increase with increasing angular momentum up to the highest values observed. This could come from a transition towards a highly deformed Jacobi-like shape, or possibly be due to the appearance of high-j intruder orbitals at the Fermi surface. We will argue that these effects can be equivalent.

  • Received 23 April 2002

DOI:https://doi.org/10.1103/PhysRevC.66.024317

©2002 American Physical Society

Authors & Affiliations

D. Ward1, R. M. Diamond1, W. J. Swiatecki1, R. M. Clark1, M. Cromaz1, M. A. Deleplanque1, P. Fallon1, A. Goergen1, G. J. Lane1,2, I. Y. Lee1, A. O. Macchiavelli1, W. Myers1, F. S. Stephens1, C. E. Svensson1,3, and K. Vetter1,4

  • 1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
  • 2Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia
  • 3Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1
  • 4Glenn T. Seaborg Institute, Lawrence Livermore National Laboratory, Livermore, California 94550

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Vol. 66, Iss. 2 — August 2002

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