Lifetimes in the yrast and an octupole-vibrational superdeformed band in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>196</mn></mrow></msup></mrow><mi mathvariant="normal">Pb</mi></math></span>

D. Roßbach; A. Görgen; H. Hübel; E. Mergel; G. Schönwaßer; F. Azaiez; C. Bourgeois; F. Hannachi; A. Korichi; A. Lopez-Martens; A. Astier; N. Buforn; N. Redon; O. Stezowski; D. Bazzacco; T. Kröll; C. Rossi-Alvarez; K. Hauschild; W. Korten; R. Lucas; H. J. Maier; P. Reiter; P. G. Thirolf; A. N. Wilson

doi:10.1103/PhysRevC.66.024316

Lifetimes in the yrast and an octupole-vibrational superdeformed band in $^{196} Pb$

D. Roßbach, A. Görgen, H. Hübel, E. Mergel, G. Schönwaßer, F. Azaiez, C. Bourgeois, F. Hannachi, A. Korichi, A. Lopez-Martens, A. Astier, N. Buforn, N. Redon, O. Stezowski, D. Bazzacco, T. Kröll, C. Rossi-Alvarez, K. Hauschild, W. Korten, R. Lucas, H. J. Maier, P. Reiter, P. G. Thirolf, and A. N. Wilson

Phys. Rev. C 66, 024316 – Published 16 August 2002

Abstract

Lifetimes have been measured for states in the yrast (band 1) and an excited superdeformed band (band 2) in $^{196} Pb .$ The excited band is thought to be built on an octupole vibration, rather than a quasiparticle excitation. Centroid shifts and line shapes of transitions in γ-ray coincidence spectra measured with the EUROBALL spectrometer have been analyzed. The transition quadrupole moments deduced from these data for the yrast and the excited superdeformed band are identical within the experimental uncertainties. This result shows that the excited band is not built on different deformation-driving orbitals compared to band 1. It is compatible with the previous suggestion of an octupole-vibrational excitation for the signature partner bands 2 and 3.

Received 29 May 2002

DOI:https://doi.org/10.1103/PhysRevC.66.024316

Authors & Affiliations

D. Roßbach, A. Görgen^*, H. Hübel, E. Mergel, and G. Schönwaßer

Institut für Strahlen- und Kernphysik, Universität Bonn, Nußallee 14–16, D-53115 Bonn, Germany

F. Azaiez and C. Bourgeois

IPN Orsay, IN2P3/CNRS, F-91406 Orsay Campus, France

F. Hannachi, A. Korichi, and A. Lopez-Martens

CSNSM Orsay, IN2P3/CNRS, F-91405 Orsay Campus, France

A. Astier^†, N. Buforn, N. Redon, and O. Stezowski

IPN Lyon, IN2P3/CNRS, Université Lyon-1, F-69622 Villeurbanne Cedex, France

D. Bazzacco, T. Kröll, and C. Rossi-Alvarez

Dipartimento di Fisica e INFN, Sezione di Padova, I-35131 Padova, Italy

K. Hauschild, W. Korten, and R. Lucas

CEA/Saclay, DAPNIA/SPhN, F-91191 Gif sur Yvette, France

H. J. Maier, P. Reiter, and P. G. Thirolf

Sektion Physik der Ludwig-Maximilians-Universität München, Am Coulombwall 1, D-85748 Garching, Germany

A. N. Wilson^‡

Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom

^*Present address: Nuclear Science Division, Lawrence Berkeley Nat. Lab., Berkeley, CA 94720.
^†Present address: CSNSM Orsay, IN2P3/CNRS, F-91405 Orsay Campus, France.
^‡Present address: Department of Nuclear Physics, RSPhS, Australian Nat. University, Canberra ACT 0200, Australia.

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Vol. 66, Iss. 2 — August 2002

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