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Report No.

Remarks on the fission barriers of super-heavy nuclei

Hofmann, S.*; Heinz, S.*; Mann, R.*; Maurer, J.*; M$"u$nzenberg, G.*; Antalic, S.*; Barth, W.*; Dahl, L.*; Eberhardt, K.*; Grzywacz, R.*; Hamilton, J. H.*; Henderson, R. A.*; Kenneally, J. M.*; Kindler, B.*; Kojouharov, I.*; Lang, R.*; Lommel, B.*; Miernik, K.*; Miller, D.*; Moody, K. J.*; Morita, Kosuke*; Nishio, Katsuhisa   ; Popeko, A. G.*; Roberto, J.*; Runke, J.*; Rykaczewski, K. P.*; Scheidenberger, C.*; Shaughnessy, D. A.*; Stoyer, M. A.*; Th$"o$rle-Pospiech, P.*; Tinschert, K.*; Trautmann, N.*; Uusitalo, J.*; Yeremin, A. V.*

Shell-correction energies of super-heavy nuclei are approximated by using Q$$_{alpha}$$ values of measured decay chains. Five decay chains were analyzed, which start at the isotopes $$^{285}$$Fl, $$^{294}$$118, $$^{291}$$Lv, $$^{292}$$Lv and $$^{293}$$Lv. The data are compared with predictions of macroscopic-microscopic models. Fission barriers are estimated that can be used to eliminate uncertainties in partial fission half-lives and in calculations of evaporation-residue cross-sections. In that calculations, fission probability of the compound nucleus is a major factor contributing to the total cross-section. The data also provide constraints on the cross-sections of capture and quasi-fission in the entrance channel of the fusion reaction. Arguments are presented that fusion reactions for synthesis of isotopes of elements 118 and 120 may have higher cross-sections than assumed so far.



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Category:Physics, Nuclear



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