To investigate the underlying mechanisms responsible for the enhanced production of new neutron-rich $N\approx 126$ nuclei in the reaction ${}^{238}\mathrm{U}+{}^{198}\mathrm{Pt}$, detailed simulations of the system at an incident energy of 8 MeV/nucleon using the improved quantum molecular dynamics model have been performed. Sequential and massive transfer processes, responsible for the production of targetlike and projectilelike $n$-rich $N\approx 126$ fragments, respectively, have been recognized. Compared to sequential transfer, the contribution from the massive transfer process plays an almost equal role for the production of new nuclei with atomic number $Z\le 76$. The two processes show distinct features in the angular and kinetic energy distributions in the laboratory system and hopefully can be disentangled experimentally.

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• Isotope separation & enrichment
• Low & intermediate energy heavy-ion reactions
• Nuclear reactions
• Transfer reactions
• A ≥ 220
• Molecular dynamics