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Alpha-gamma decay studies of 255No

Authors:	F P Heßberger S Hofmann D Ackermann S Antalic B Kindler I Kojouharov P Kuusiniemi M Leino B Lommel R Mann K Nishio A G Popeko B Sulignano S Saro B Streicher M Venhart A V Yeremin

Institution:	1. Gesellschaft für Schwerionenforschung (GSI), D-64220, Darmstadt, Germany 2. Institut für Physik, Johann Wolfgang Goethe - Universit?t Frankfurt, D-60054, Frankfurt, Germany 3. Department of Physics, Comenius University Bratislava, SK-84248, Bratislava, Slovakia 4. Department of Physics, University of Jyv?skyl?, FIN-40014, Jyv?skyl?, Finland 5. Japan Atomic Energy Agency (JAEA), 319-1195, Ibaraki, Japan 6. Flerov Laboratory of Nuclear Reactions, JINR, RUS-141890, Dubna, Russia 7. Institut für Physik, Johannes Gutenberg-Universit?t, D-55099, Mainz, Germany

Abstract:	The decay of ²⁵⁵No was investigated by means of α-γ spectroscopy. The isotope was produced in the reactions ²⁰⁸Pb(⁴⁸Ca, n)²⁵⁵No, $\mathrm{{}^{209}Bi({}^{48}Ca,2n){}^{255}Lr \ {}^{\ensuremath \mathit{EC}}_{\rightarrow}\ {}^{255}No}$ , and $²³⁸U(²²Ne, 5n)²⁵⁵No$. Levels of the daughter nucleus ²⁵¹Fm were assigned by α-γ coincidence measurements and on the basis of systematics. Level energies were determined precisely using measured γ-rays. The results are compared with the known level schemes of the lighter $\ensuremath N=151$ isotones ²⁴⁷Cm and ²⁴⁹Cf as well as with data for ²⁵³No.

Keywords:	PACS" target="_blank">PACS 23 60 +e Alpha decay 27 90 " target="_blank">+b $\ensuremath 220\leq A$ " target="_blank">gif" alt="$\ensuremath 220\leq A$" align="middle" border="0"> 21 10 -k Properties of nuclei nuclear energy levels
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