ROLE OF MASS ASYMMETRY IN FUSION OF SUPER-HEAVY NUCLEI

By using well tested standard statistical model for calculating survival probabilities of super-heavy compound nuclei, P surv , and reliably predicted capture cross sections σ cap , "empirical" values of the fusion hindrance P fus = σ syn /(σ cap · P surv ) have been determined from the formation cross sections σ syn for production of super-heavy nuclei of 102 ≤ Z ≤ 113 measured at GSI Darmstadt and RIKEN. So determined fusion hindrance can be well reproduced with a simple model based on the Smoluchowski diffusion equation applied to describe thermal shape fluctuations of the fusing system. An applicability of this model for a wider class of fusing systems could be verified on data from an interesting experiment on the synthesis of isotopes of Hs (Z = 108) in the 136 Xe + 136 Xe reaction, scheduled to be carried out in Dubna this year. Synthesis cross sections for 269-271 Hs isotopes, strongly reduced by the fusion hindrance effect in this symmetric fusion reaction, are predicted.

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