Cold 86Kr valley in superheavy Z = 104-120 nuclei

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Based on the cold fusion reaction valleys, referring to the minima in the potential energy surfaces calculated on quantum mechanical fragmentation theory, some of us and collaborators suggested the use of a 86Kr beam or its neighbouring nuclei in their very first publications of 1976-7. More recently, one of us (RKG) and collaborators stressed its use again in 1993-4. In view of the very recent experiments, reporting the use of a 86Kr beam for the cold synthesis of the Z = 118 element, here we have re-investigated this problem for a large number of Z = 104-120 nuclei. We find that the use of a 86Kr beam for cold fusion reactions is as appropriate as the Pb and Ca nuclei and the optimum targets are 174Yb, 184W and 208Pb, respectively, for synthesizing the 260106Sg, 270110 and 294118 nuclei. The 86Kr + 208Pb is the reaction used in the above-mentioned Berkeley and GSI experiments. For other elements, lighter than Z = 118, the 34Se beam is found to compete with the 36Kr beam, whereas for Z>118 elements 38Sr is shown to be a natural choice. 32Ge and 40Zr are found to be more suitable for the production of neutron-rich isotopes, thereby requiring the use of radioactive nuclear beams. The radioactive nuclear beams (and targets) are predicted to be of great use for many other nuclei. The role of 86Kr (being similar to the doubly magic 208Pb or 48Ca) is perhaps related to the recently predicted strong shell stabilizing effects of 76Kr in cluster decay studies.

Document Type: Miscellaneous

Affiliations: 1: Physics Department, Panjab University, Chandigarh, 160014, India 2: Gesellschaft für Schwerionenforschung mbH, 64220 Darmstadt, Germany 3: Institut für Theoretische Physik, J-W Goethe Universität, 60054 Frankfurt am Main, Germany 4: Institut für Theoretische Physik, J-L Universität, 35392 Giessen, Germany

Publication date: January 1, 2001

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