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By S. Hofmann, F. P. Heßberger, D. Ackermann, B. Kindler, J. Kojouharova, B. Lommel, R. Mann, G. Münzenberg, H. J. Schött, Gsi Darmstadt, A. G. Popeko, A. V. Yeremin, Jinr Dubna, S. Antalic, P. Cagarda, S. Saro and S. Ćwiok


Synthesis and investigation of heavy even-even nuclei provide especially clear data for comparison with theoretical predictions. The absence of unpaired nucleons results in unhindered α decay or spontaneous fission. Also the low-energy level scheme is expected to be relatively simple. However, the synthesis of even-even nuclei is more difficult by the fact, that in fusion reactions with 208 Pb and neutron rich projectiles 2 neutrons must be evaporated, or the target must be replaced by 207 Pb. In both cases the measured cross-sections for the synthesis of nuclei beyond rutherfordium revealed a stronger decrease than in 1n reactions using 208 Pb targets. Consequently, only few eveneven nuclei are known beyond rutherfordium with 264 Hs being so far the heaviest one produced in reactions wit

Year: 2011
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