We brought to light the primordial importance and relevance of the neck-formation/neck-length parameter defined within the two center shell model, especially for the synthesis of new superheavy elements. We have implemented the quantum mechanical fragmentation theory in the dynamical cluster-decay model for the decay of a hot and rotating compound nuclear system. This theory provides a central idea to understanding the nucleus-nucleus collisions and the subsequent decay processes together such as fission and evaporation residue, etc. Our recently published result in the case of $Z=116$ and 118 has became a thrust of this work; we have successfully predicted the practical range of the cross sections of decay channels without tracing the experimental data. Henceforth, we can show that the neck-length parameter has a genuine power to predict the approximate cross section values for unknown decay channels. Such calculations may be useful for guiding experimentalists to choose adequate systems for the production of future superheavy elements

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• Low & intermediate energy heavy-ion reactions
• Nuclear reactions
• Nuclear structure & decays
• Synthesis of new superheavy elements