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Nuclear Structure and Reactions
Alpha-gamma decay studies of 255Rf, 251No and 247Fm
Gesellschaft für Schwerionenforschung (GSI), D-64220, Darmstadt, Germany
2 Institut für Physik, Johann Wolfgang Goethe - Universität Frankfurt, D-60054, Frankfurt, Germany
3 Department of Physics, Comenius University Bratislava, SK-84248, Bratislava, Slovakia
4 Department of Physics, University of Jyväskylä, FIN-40014, Jyväskylä, Finland
5 Japan Atomic Energy Agency (JAEA), 319-1195, Tokai, Ibaraki, Japan
6 Flerov Laboratory of Nuclear Reactions, JINR, RUS-141890, Dubna, Russia
7 Institut für Kernchemie, Johannes Gutenberg-Universität, D-55099, Mainz, Germany
Accepted: 22 October 2006
Published online: 7 December 2006
The decay of the isotopes 255Rf, 251No and 247Fm produced in the reactions , and was investigated by means of α-γ spectroscopy. Previously observed γ transitions in coincidence with α decays of 255Rf were confirmed, their energies and line intensities were measured more precisely, and their multipolarities were determined as E1. In 251No a new isomeric state at E * > 1700keV with a half-life of ≈ 2μs was identified. The decay of 247Fm was measured more precisely. A partial level scheme of the daughter nucleus 243Cf could be established.
PACS: 23.60.+e α decay – / 27.90.+b 220 ⩽ A – / 21.10.-k Properties of nuclei; nuclear energy levels –
© Società Italiana di Fisica and Springer-Verlag, 2007