EPJ

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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 10, 129-133

New microsecond isomers in $\bf {^{189,190}Bi}$

A.N. Andreyev1, D. Ackermann2, P. Cagarda3, J. Gerl2, F.P. Heßberger2, S. Hofmann2, M. Huyse1, A. Keenan4, H. Kettunen5, A. Kleinböhl2, A. Lavrentiev6, M. Leino5, B. Lommel2, M. Matos3, G. Münzenberg2, C.J. Moore4, C.D. O'Leary4, R.D. Page4, S. Reshitko2, S. Saro3, C. Schlegel2, H. Schaffner2, M.J. Taylor4, P. Van Duppen1, L. Weissman1 and R. Wyss7

1  Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
2  Gesellschaft fur Schwerionenforschung Darmstadt, Postfach 110541, 6100 Darmstadt, Germany
3  Department of Nuclear Physics,Comenius University, Bratislava, Slovakia
4  Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
5  Department of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland
6  Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980, Dubna, Russia
7  Department of Physics, Royal Institute of Technology, 104 05 Stockholm, Sweden

aan@ns.ph.liv.ac.uk

(Received: 20 December 2000 Communicated by J. Äystö)

Abstract
New microsecond isomers in the neutron-deficient isotopes 189g,190Bi have been identified after in-flight separation by the velocity filter SHIP. The evaporation residues were identified on the basis of delayed recoil-$\gamma$/X-ray, recoil-$\gamma$/X-ray-$\alpha$ and excitation function measurements. The systematics of the [ $\pi1i_{13/2}$] 13/2+ excited states in the odd-mass Bi nuclei is discussed.

PACS
23.60.+e - $\alpha$-decay.
27.70.+q - $150\leq A \leq 189$ .
27.80.+w - $190 \leq A \leq 219$ .

© Società Italiana di Fisica, Springer-Verlag 2001

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