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Deep inelastic scattering in $^{154}$Sm+$^{160}$Gd at energies above the Bassbarrier is for the first time investigated with two different microscopicdynamics approaches: improved quantum molecular dynamics (ImQMD) model and timedependent Hartree-Fock (TDHF) theory. No fusion is observed from both models.The capture pocket disappears for this reaction due to strong Coulomb repulsionand the contact time of the di-nuclear system formed in head-on collisions isabout 700 fm/c at an incident energy of 440 MeV. The isotope distribution offragments in the deep inelastic scattering process is predicted with thesimulations of the latest ImQMD-v2.2 model together with a statistical code(GEMINI) for describing the secondary decay of fragments. More than 40extremely neutron-rich unmeasured nuclei with $58 \le Z\le 76$ are observed andthe production cross sections are at the order of ${\rm \mu b}$ to mb. Themulti-nucleon transfer reaction of Sm+Gd could be an alternative way tosynthesize new neutron-rich lanthanides which are difficult to be produced withtraditional fusion reactions or fission of actinides.

New neutron-rich isotope production in $^{154}$Sm+$^{160}$Gd