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Nuclear Structure and Reactions
Alpha-gamma decay studies of 255Rf, 251No and 247Fm
F. P. Heßberger1, S. Hofmann1,2, D. Ackermann1, S. Antalic3, B. Kindler1, I. Kojouharov1, P. Kuusiniemi1, M. Leino4, B. Lommel1, R. Mann1, K. Nishio5, A. G. Popeko6, B. Sulignano1,7, S. Saro3, B. Streicher3, M. Venhart3 and A. V. Yeremin6
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