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Quadrupole moments of wobbling excitations in Lu163

A. Görgen, R. M. Clark, M. Cromaz, P. Fallon, G. B. Hagemann, H. Hübel, I. Y. Lee, A. O. Macchiavelli, G. Sletten, D. Ward, and R. Bengtsson
Phys. Rev. C 69, 031301(R) – Published 4 March 2004

Abstract

Lifetimes of states in the triaxial strongly deformed bands of Lu163 have been measured with the Gammasphere spectrometer using the Doppler-shift attenuation method. The bands have been interpreted as wobbling-phonon excitations from the characteristic electromagnetic properties of the transitions connecting the bands. Quadrupole moments are extracted for the zero-phonon yrast band and, for the first time, for the one-phonon wobbling band. The very similar results found for the two bands suggest a similar intrinsic structure and support the wobbling interpretation. While the in-band quadrupole moments for the bands show a decreasing trend towards higher spin, the ratio of the interband to the in-band transition strengths remains constant. Both features can be understood by a small increase in triaxiality towards higher spin. Such a change in triaxiality is also found in cranking calculations, to which the experimental results are compared.

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  • Received 22 August 2003

DOI:https://doi.org/10.1103/PhysRevC.69.031301

©2004 American Physical Society

Authors & Affiliations

A. Görgen1,2, R. M. Clark1, M. Cromaz1, P. Fallon1, G. B. Hagemann3, H. Hübel4, I. Y. Lee1, A. O. Macchiavelli1, G. Sletten3, D. Ward1, and R. Bengtsson5

  • 1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2DAPNIA∕SPhN, CEA Saclay, F-91191 Gif-sur-Yvette, France
  • 3The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark
  • 4HISKP, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany
  • 5Department of Mathematical Physics, Lund Institute of Technology, S-22362 Lund, Sweden

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Vol. 69, Iss. 3 — March 2004

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