Eur. Phys. J. A 11, 121-124 (2001)

Investigation of the magnetic rotation in ¹⁹⁶Pb

G. Kemper¹, A. Dewald¹, I. Wiedenhöver¹, R. Peusquens¹, S. Kasemann¹, K.O. Zell¹, P. von Brentano¹, H. Hübel², S. Chmel², A. Görgen², D. Bazzacco³, R. Venturelli³, S. Lunardi³, D.R. Napoli⁴, F. Hannachi⁵, A. Lopez-Martens⁵, R. Krücken⁶, J.R. Cooper⁶, R.M. Clark⁷, M.A. Deleplanque⁷, I.Y. Lee⁷, A.O. Machiavelli⁷ and F.S. Stephens<sup>7

1</sup>  Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
²  Institut für Strahlen- und Kernphysik, Universität Bonn, Bonn, Germany
³  Dipartimento di Fisica, Università and INFN Sezione Padova, Italy
⁴  INFN, Laboratori Nazionali di Legnaro, Italy
⁵  Institut de Physique Nucleaire, 91405 Orsay, Cedex, France
⁶  A.W. Wright Nuclear Structure Laboratory Yale University, New Haven, CT 06520, USA
⁷  Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

rp@ikp.uni-koeln.de

(Received: 3 May 2001 Communicated by D. Schwalm)

Abstract
Lifetimes for low-lying members of the irregular band in ¹⁹⁶Pb have been measured by means of the EUROBALL spectrometer using the coincidence recoil distance technique. The ¹⁶⁴Dy(³⁶S,4n)¹⁹⁶Pb reaction at a beam energy of 168 MeV was used. The data were analyzed with the differential decay-curve method (DDCM). A characteristic drop in the reduced transition probabilities with increasing angular momentum was observed in agreement with predictions by the semiclassical model for the shears mechanism.

PACS
21.10.Ky - Electromagnetic moments.
21.10.Re - Collective levels.
23.20.-g - Electromagnetic transitions.
27.80.+w - .

© Società Italiana di Fisica, Springer-Verlag 2001