https://doi.org/10.1140/epja/i2003-10050-2
OriginalPaper
$\alpha$-decay spectroscopy of light odd-odd Bi isotopes - I: 188,190Bi nuclei
1
Department of Physics, Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
2
Gesellschaft fur Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany
3
Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, Leuven, Belgium,
4
Department of Physics, University of Jyväskylä, FIN-40351, Jyväskylä, Finland
5
Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980, Dubna, Russia
6
Department of Nuclear Physics, Comenius University, SK-84248, Bratislava, Slovakia
7
Department of Physics, Royal Institute of Technology, 104 05, Stockholm, Sweden
8
Vakgroep Subatomaire en Stralingsfysica, University of Gent, B-9000, Gent, Belgium
9
Institut für Physik, Johannes Gutenberg-University, Staudingerweg 7, D-55099, Mainz, Germany
* e-mail: aan@ns.ph.liv.ac.uk
Detailed fine-structure $\alpha$-decay studies of 188,190Bi were performed using the complete-fusion reactions of 50,52Cr ions with a 142Nd target at the velocity filter SHIP. The evaporation residues were separated in-flight and subsequently identified on the basis of recoil-$\alpha$, recoil-$\alpha$-$\gamma$/X-ray and excitation function measurements. Improved data on the $\alpha$-decay of 188,190Bi were obtained and a number of new low-lying excited states in the daughters 184,186Tl were observed. An intruder, presumably 10- state was identified in 184Tl, extending the systematics of such states in the odd-odd Tl nuclei beyond the neutron mid-shell at N = 104. Some technical aspects of experiment at recoil separators are also discussed.
© Società Italiana di Fisica and Springer-Verlag, 2003
