Abstract
By using the dinuclear system (DNS) model we determine the capture of reactants at the first stage of reaction, the competition between the DNS decay by the quasifission (QF) and the complete fusion (CF) process up to formation of the compound nucleus (CN) having compact shape. Further evolution of the CN is considered as its fission into two fragments or formation of evaporation residues (ER) by its cooling after emission of neutrons or/and charged light particles. Disappearance of the CN fission barrier due to its fast rotation leads to the fast fission (FF) by formation of fissionlike fragments. The results of calculations for the mass symmetric 136 Xe+ 136 Xe reaction, almost mass symmetric 108 Mo+ 144 Ba reaction, and mass asymmetric like 24 Mg+ 238 U and 34 S+ 248 Cm reactions are discussed. The fusion probability P CN calculated for many massive nuclei reactions leading to formation of superheavy nuclei have been analyzed. The reactions which can lead in perspective to the synthesis of superheavy elements in the Z = 120 − 126 range and, eventually, also to heaviest nuclei, are discussed.
Highlights
In order to give realistic estimations of cross sections of the reaction products by mass symmetric or almost symmetric entrance channel an adequate model allowing us to describe by a likelihood way the complex dynamics of the mechanisms during all stages of reaction has to be developed
On the basis of dynamical and statistical calculations we studied a formation of a dinuclear system in the entrance channel and its subsequent evolution to be transformed into compound nucleus in a competition with quasifission
The distribution of the PCN fusion probability versus the compound nucleus (CN) charge ZCN, angular momentum in the entrance channel and Ec.m. energy has been estimated for a wide set of reactions
Summary
In order to give realistic estimations of cross sections of the reaction products by mass symmetric or almost symmetric entrance channel an adequate model allowing us to describe by a likelihood way the complex dynamics of the mechanisms during all stages of reaction has to be developed. For example, in the case of the 48Ca+249Cf reaction, the identification of the 294Hs nucleus as the evaporation residue of the 297Hs CN after the emission of 3 neutrons In the last case the 48Ca+250Cf reaction (leading to the 298Hs CN) the same 294Hs evaporation residue nucleus is formed after emission of 4 neutrons from CN This effdeectterdmepineenddsboynththeecEolC∗lNisieoxncietanteirognyeEnec∗.rmg.y. CN which is addition, the use of some assumptions about the reaction mechanisms leading to the formation of the observed fissionlike fragments, does not allow for sure correct determination of the fusion-fission contribution in the case of overlapping of the mass fragment distributions of different processes (quasifission, fast fission and fusion-fission).
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