Collectivity in neutron-deficient Pb and Po nucleiT. Grahn1, 2, A. Dewald3, O. Möller3, R. Julin1, C.W. Beausang4, S. Christen3, I.G. Darby1, 2, S. Eeckhaudt1, P.T. Greenlees1, A. Görgen5, K. Helariutta6, J. Jolie3, H. Kettunen1, T. Kröll7, R. Krücken7, P. Jones1, S. Juutinen1, Y. Le Coz5, M. Leino1, A.-P. Leppänen1, P. Maierbeck7, B. Melon3, D.A. Meyer4, P. Nieminen1, M. Nyman1, R. Page2, J. Pakarinen1, 2, P. Petkov8, P. Rahkila1, B. Saha3, M. Sandzelius1, J. Sarén1, C. Scholey1 and J. Uusitalo1
1 Department of Physics, University of Jyväskylä, PL 35, 40014 University of Jyväskylä, Finland
2 Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
3 Institut für Kerphysik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
4 Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520, USA
5 CEA Saclay DSM/DAPNIA/SPhN, 91191 Gif-sur-Yvette Cedex, France
6 Laboratory of Radiochemistry, Department of Chemistry, PL 55, 00014 University of Helsinki, Finland
7 Physik-Department E12, TU München, 85748 Garching, Germany
8 Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
(Received: January 31, 2007 / Published online: 8 December 2007)
Lifetimes of low-lying yrast states in and have been determined by employing, for the first time, the recoil-decay tagging technique in recoil distance Doppler-shift lifetime measurements. In addition, lifetime measurements of prolate states in up to the 8+ state were carried out using the recoil gating method. The deformation parameters and for the prolate and the oblate bands, respectively, have been extracted from the measured lifetimes. 27.70.+q-
21.10.Tg - - -.
27.80.+w - -.
© EDP Sciences, Springer-Verlag 2007